I've been doing the same thing since the beginning of feburary.
I took a cart cap, pierced the end with my filling syringe, and then stretch the cap over the atty. Insert syringe, and start forcing pga in and out. I've put some major force on the syringe plunger and the cap has never slipped off.
http://www.e-cigarette-forum.com/forum/e-cigarette-maintenance/69199-new-way-clean-510s.html<<<SHAMELESS PLUG
yes I am sure there a bunch of techniques that are used adapted and thought of... I mean there are only so many ways to skin a cat
That's cool that you have something that works .. you know anything that will help us continue enjoying our vape experience