I was reading over a sticky on injection tips.
I never did this one
Step 7
Remove the needle from the vial. With the needle pointing upwards, pull back on the plunger until all oil from the needle has been pulled back into the syringe. Unscrew needle from syringe and replace with a brand new, preferrably smaller needle. Replace needle guard.
I would just change the needle and throw the other 18g one out.. I now see that i was wasting oil that was left in the pin and i guess shooting a little air in my ass.
How much did i waste by doing this and is that little bit of air going to hurt?