Greencig carts (i have some from Vapor4life) and some 901 D end whistle tips..here's a mod that'll absolutely make you wet yourself.
Remove the paper crap from the cartomizer carefully and clean with something that'll cut glue. I used lighter fluid, but i dont recommend that due to risk of bursting into flames or something..but it's what i had and works for this purpose.
Cut the cart off at exactly 1" from the battery end...best way is to get the sharpest knife or razor knife blade you can find, measure carefully..then place the blade of aforementioned impossibly sharp knife against the cartomizer and precicely 90degrees to the length of the cart and roll it..much like a tubing cutter.
this works because the cartomizers are made of what used to be called "dead soft aluminum" and is about as soft as lead.
once through it, you'll have a short little 1" atty with threads...what to do with it?
remove the factory internal cart and toss it aside..havnt found a use for it yet.
retrue the cut end..which if you did your job right will be perfectly round but pinched in from the cut slightly. easiest way is to stick another slightly smaller round object in it like a bic ink pen or drill bit and roll it on a really hard surface..counter top or glass..bearing down on the ink pen as you do so..so that the edge of the cart is being pinched between the pen/drill bit end (the smooth shank end not the drilling end DOH!) and the really hard flat surface which will flatten it back to round and not pinched. Be careful of the hair! dont roll it, dont stick your bic pen or drill bit shank in that far!
This job is finished when a 901 D cart goes in snugly and it is the proper diameter so long as the pinched end is restored to straightness..but read the whole post first because alignment is critical before you test fit.
now look inside the cartomizer. You'll see hair made of fiberglass which functions as the wick. looking closely you'll see that its in a bundle to one side, with a larger air space on the other side, and the atomizer coil is loosely situated in the middle.
pack a new "D" 901 cart with your favorite filling material and fill the cart with your favorite juice....
now for the critical bit..only bit thats inconvenient...cart alignment: must be followed exactly:
your "D" cart is shaped like a D (just like the factory internal cart you removed and tossed aside) the rounded end of the "D" (D<) goes on the same side as the hair is leaning against, and the air hole goes over on the open area when you install the cart. It must be inserted this way, and it must be a "D" cart.
You *can* use an empty cart and drip it (drip only on hair, and hair holds like 2 drops when its entirely and totally dry might even force 3..but be wary that it'll leak if you empty a bottle on it)
If you have a totally and utterly dry wick (the hair) a full cart can and will be a plenty to fill the atty without having to drip it as well, the wicking ability of that fiberglass hair is insane..seriously.
Now, why do all this?
You've created a 901 that works! No leaking in the pocket. hold and vape in any direction without leaks! no constant topping off, that damn hair will utterly drain dry a 901 cart *every* time..the hair is self regulating and doesnt flood so long as you start with a full cart and dont dump sauce down the bore.
I'm not even almost kidding, ive been usin one for two days and carrying it in my pocket vertical with an auto battery.
NOTE: GC carts are similar to other cartomizers except that they only work "right" on a GC batt. for a Vapor King or other KR808D-1 batt you have to spin them down snug, then back off like 1/4 turn to get air flow..which works cause the Vapor King batt has little air holes in the threads. This method=fail for 901 batts and for Vapor King manual (sealed) batts. GC/901/KR808D-1 batts share a common thread..the issue here is air flow.
Vapor Country sells a "cartomizer adaptor" that does in fact work, but switch sensitivity is an issue here, should be fine with true SLB batts or VK batts, but some generics may not fire. the "Cartomizer adaptor" will work with a manual batt however obviously.
If you have one laying around..try it. you'll be stunned. it's like everything a 901 should have been, but never achieved..it doesnt even need teabag or straw mods! Unfortunately the atomizer design creates a milder throat hit than most other e-cigs, but vapor production is pretty shocking when you vape it...and another benefit is that it'll feed VG no matter how thick...I just used a cart of Vermont Vapor's Maple..which some of you know is like motor oil...omg thick and prone to not wicking in a standard 901. It works well with those factory filled carts that don't wick for crap, and it tames down flavors that were overpowering or ugly before. You don't need VG to get OMG vapor (considering the size and batt) even PG will produce plumes equal to or greater than a 3.7v 901.
I can't believe the 901 isnt made this way.
as far as lifespan goes..im still trying to kill it, i cant find a way to make it fail yet.
Unfortunately it doesn't respond well to high voltage or passthrougs..it seems a little harsh or even burnt juice tasting at higher volts...its not burnt wick though, I cant seem to burn that fiberglass no matter how hard i tried.
Good luck, and anyone with piles of these laying around who tries it, post and let folks know what happened...its shocking.
Remove the paper crap from the cartomizer carefully and clean with something that'll cut glue. I used lighter fluid, but i dont recommend that due to risk of bursting into flames or something..but it's what i had and works for this purpose.
Cut the cart off at exactly 1" from the battery end...best way is to get the sharpest knife or razor knife blade you can find, measure carefully..then place the blade of aforementioned impossibly sharp knife against the cartomizer and precicely 90degrees to the length of the cart and roll it..much like a tubing cutter.
this works because the cartomizers are made of what used to be called "dead soft aluminum" and is about as soft as lead.
once through it, you'll have a short little 1" atty with threads...what to do with it?
remove the factory internal cart and toss it aside..havnt found a use for it yet.
retrue the cut end..which if you did your job right will be perfectly round but pinched in from the cut slightly. easiest way is to stick another slightly smaller round object in it like a bic ink pen or drill bit and roll it on a really hard surface..counter top or glass..bearing down on the ink pen as you do so..so that the edge of the cart is being pinched between the pen/drill bit end (the smooth shank end not the drilling end DOH!) and the really hard flat surface which will flatten it back to round and not pinched. Be careful of the hair! dont roll it, dont stick your bic pen or drill bit shank in that far!
This job is finished when a 901 D cart goes in snugly and it is the proper diameter so long as the pinched end is restored to straightness..but read the whole post first because alignment is critical before you test fit.
now look inside the cartomizer. You'll see hair made of fiberglass which functions as the wick. looking closely you'll see that its in a bundle to one side, with a larger air space on the other side, and the atomizer coil is loosely situated in the middle.
pack a new "D" 901 cart with your favorite filling material and fill the cart with your favorite juice....
now for the critical bit..only bit thats inconvenient...cart alignment: must be followed exactly:
your "D" cart is shaped like a D (just like the factory internal cart you removed and tossed aside) the rounded end of the "D" (D<) goes on the same side as the hair is leaning against, and the air hole goes over on the open area when you install the cart. It must be inserted this way, and it must be a "D" cart.
You *can* use an empty cart and drip it (drip only on hair, and hair holds like 2 drops when its entirely and totally dry might even force 3..but be wary that it'll leak if you empty a bottle on it)
If you have a totally and utterly dry wick (the hair) a full cart can and will be a plenty to fill the atty without having to drip it as well, the wicking ability of that fiberglass hair is insane..seriously.
Now, why do all this?
You've created a 901 that works! No leaking in the pocket. hold and vape in any direction without leaks! no constant topping off, that damn hair will utterly drain dry a 901 cart *every* time..the hair is self regulating and doesnt flood so long as you start with a full cart and dont dump sauce down the bore.
I'm not even almost kidding, ive been usin one for two days and carrying it in my pocket vertical with an auto battery.
NOTE: GC carts are similar to other cartomizers except that they only work "right" on a GC batt. for a Vapor King or other KR808D-1 batt you have to spin them down snug, then back off like 1/4 turn to get air flow..which works cause the Vapor King batt has little air holes in the threads. This method=fail for 901 batts and for Vapor King manual (sealed) batts. GC/901/KR808D-1 batts share a common thread..the issue here is air flow.
Vapor Country sells a "cartomizer adaptor" that does in fact work, but switch sensitivity is an issue here, should be fine with true SLB batts or VK batts, but some generics may not fire. the "Cartomizer adaptor" will work with a manual batt however obviously.
If you have one laying around..try it. you'll be stunned. it's like everything a 901 should have been, but never achieved..it doesnt even need teabag or straw mods! Unfortunately the atomizer design creates a milder throat hit than most other e-cigs, but vapor production is pretty shocking when you vape it...and another benefit is that it'll feed VG no matter how thick...I just used a cart of Vermont Vapor's Maple..which some of you know is like motor oil...omg thick and prone to not wicking in a standard 901. It works well with those factory filled carts that don't wick for crap, and it tames down flavors that were overpowering or ugly before. You don't need VG to get OMG vapor (considering the size and batt) even PG will produce plumes equal to or greater than a 3.7v 901.
I can't believe the 901 isnt made this way.
as far as lifespan goes..im still trying to kill it, i cant find a way to make it fail yet.
Unfortunately it doesn't respond well to high voltage or passthrougs..it seems a little harsh or even burnt juice tasting at higher volts...its not burnt wick though, I cant seem to burn that fiberglass no matter how hard i tried.
Good luck, and anyone with piles of these laying around who tries it, post and let folks know what happened...its shocking.
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just when I thought it couldn't get any better, I am blown away!.... I was already using 901 flat carts on the end of my GC carts, just cuz I like the flat tips, but this is insanely wonderful.. I'm blowing MONSTER BILLOWS of delicious Pear Lung vapor clouds! (It works fine with my PT also). my first top-off was 12 drops, and I could have gone longer!!!! And maybe it's my imagination, or maybe just the huge quantity of vapor but I've never had this intensity of flavor. MMMMMM-whooo, I am liking this! 
