Pop the wool holder off the mouth piece and put the old mouth piece on wool holder (white part). I have some carts that fit to tight and this is what I have done.
I've bought penstyle carts from various places....don't have much idea which model they are but I have used them with various atomizers on my KB. I realize some do fit tighter but sometimes they loosen up with use. Never noticed any I couldn't use with it though. Hmmm....
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