I need to rotate some sites around but i cannot fucking aspirate 1 handed on my shoulders. I can but then by the time i get no blood the pin has moved around so fucking much im gonna be sore for a week and theres no telling if its in a vein at that point. Im starting to see it as a pointless task if your doing it one handed unless your a hell of a lot more steady handed then me. Not to mention my short ass fingers dont help.