Been awhile since I posted about my experiences with the Penquin although I do still follow the
thread. I haven't had one bad coil since my last posts. The one big reason I have to believe is in Priming the coils. It's the number one top priority when adding a new coil or first starting out. If you think you've primed it enough, prime it some more.
@mikepetro has a nice post about his method which I am doing now also, pre soaking the next coil to use is a great idea.
My method of using that first new coil is to drip the top opening feed hole , let that soak in
and repeat until the liquid actually starts to flow out on the bottom coil base. You can set the coil on a paper towel and keep doing that. My coils now are lasting until I think the flavor is diminishing , not because of bad or burnt hit. I also no longer have to pull my coil out to refill because of a modification I've done to my cartridges.
(not recommending this, just explaining what I did)
I made a top fill hole by piercing the cartridge on top between the air inlet and mouthpiece. My method to do that was by using a pliers to hold a nail and heating the nail using a Bic lighter and boring into the tank. Making sure the hole was large enough to insert the fill tip of the liquid bottle or those eye dropper tips. I then used the shortest flat headed screw I had available (any hardware store will have) Here's a pic of my well used unappealing looking Penquin. I also still use a sticker to cover full air intake. Easy to adjust amount of opening I find I like.
Note: IF you should happen to try this, Don't remove the screw unless to refill. Having liquid
in the tank and the hole left open will cause your tank to flood, that seal must be air tight or the atmospheric pressure will try and equalize all the chambers.
I have one ugly Penquin , but it's working awesome and I love it.