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Also is there a way to clean these? Whenever I fill them they almost always get juice in the center tube. i think that juice ends up drying and getting hard causing a slower draw...any fix for this?
When I used filler type cartos, I would Always put 2 drops of juice down the center airway Before I would fill the carto. The fill as usual. Once it was filled, I would hold a paper towel over the battery end and give it a gentle blow to ensure that the air way was clear. Never had a problem with dry spots.
Do an ECF search for "carto cleaning" and I'm sure you will get page after page of info.
For a hard draw there is Two things you can do.
1) Take a straighten out paper clip and GENTLY push it thru the battery end until it comes out the mouth piece hole. I said GENTLY because if it hangs up on the atomizer coil wire had you force it, your going to break the atomizer wire. Then the carto is No Workie.
Once the paper clip is thru the cart, roll the carto on the paper clip bread rolling pin style. This opens up the airway and should make a huge difference.
2) The other thing, a last resort, is to enlarge one or both of the side holes with a 1/16th drill. All you need to do is to break thru the metal and go no further. If your going to use the drill tech, I would suggest you do one hole and see how it goes.