So this is the first time i've ever seen multi use vials, i just want to check that all i do is stick the pin through the round indentation in the lid? its a typical silver round lid, and there is a circular engraving in the middle, about a centimeter in diameter. i stick the pin anywhere through this right? and there is meant to be a rubber lining underneath it to seal it back up when i remove the needle right? should i keep sticking the pin in the same spot each week or does it not matter if you create a few different holes?
thanks
thanks