Nah, just drip til the top is wet but remove the carto off the batt and put on the "coned" condom on the bottom. One can't really say this many drops or that many cuz it depends on how much you've vaped off it. I never have to top off cuz I usually vape the days carto and change it the next day. I probably waste some
juice, but not much, cuz the carto is getting flat by the time I get home.
This is how I prefer to fill without getting overfilled or getting
juice on the battery side.
Take the carto "condom", the one with the plug (cone) inside it and put it on the threaded side of the carto. This'll close the hole. Take the 14ga blunt and syringe, remove the dripper tip off the bottle of juice and draw up slightly less than 1ml of juice. Insert the blunt down the carto central tube (GENTLY!) til it bottoms out and press the plunger until juice starts to flood the top. Retract the plunger to suck back the excess, it won't remove what soaked in, and squirt remaining juice back in the bottle. Don't forget to draw up a little air before replacing the excess or you'll leave juice in the needle. Remove condom and swab bottom lightly with a cloth or q-tip (just in case). If condom is dry, reuse and replace (both condoms) on carto and go to the next one, or put it on the batt and vape away!
I fill/clean cartos on Sunday. 6 cartos will last me the week cuz I use a tank at home. I have a little velvet bag I keep a couple cartos and the extra batt in and it stays in my lunchbox so I always have extra. Just in case.....
A lot of folks want to get complex with the process, but it's not complex. I believe in the KISS method and it works fine. Never caught with my pants down yet!