I cant understand why you guys dont put the cap in the needle and fill it from the other end.. take out the plunger and fill it up put the plunger back in and hold it upside down needle part sticking up and push the air out?minimum size useful for e-juice. PG is fine but VG is a bit of a struggle. It works but (especially drawing it into the syringe) it's slow.
I did this all the time when giving my cats or dogs medicine.. without the needle of course...and I have never used a syringe to fill any carto "YET" but reading through all this I had to just ask why this method would not work?