I do it every damn day Lol So for 1ml of Test & Tren each - Draw 1ml Test, Pull this down to the 2ml mark (so between 0 and 1ml is free), then draw again pulling the whole lot down to 3ml and waiting till the Tren fills up to the 1ml mark. You can also plunge air back into the vial by drawing 0.5ml then allowing it to return due to the back pressure created from drawing, then pull down .5ml again. You'll soon get the hang of it!

Done before with an old eod cycle (test/tren) just draw as normal from first vial. Then push juice to end of syringe and draw from next vial. Change needles during if you want, fresh one before injection as normal.

Pushing syringe full of air into vial creates pressure, which allows for less air bubbles. Plus quicker draw time, I don't need to pull back does it itself. Then I'll release pressure after. Not needed but that's me.