I was told to use a drawing pin because it is not good to use the same pin that you have already put into the bottle to suck out the oil because the pin gets dull when you put it through the rubber.
So I suck out the oil, then change the pin to a fresh one then inject.
1. Is this necessary?
2. Is there a way to keep this "drawing pin" clean so that I can keep re-using it instead of wasting 2 needles every time?