Option 1: unscrew, fill a syringe or skinny pipette with Heavy VG juice which is a total pain. Inject the atty. Check wicks and build. Rescrew. Clean syringe.
Option 2: unscrew. Put 140 drops of heavy VG into atty using a still hand. Check wicks and build. Rescrew.
Explain which one is easy?
www.onestopdiyshop.com has 50ml needle tip bottles for 40 cents each. I can fill the 6ml from empty in less than 15 seconds. I'm using 90 VG juice. That's pretty easy in my book.