Vial Rubber Stopper

Post a picture of the stopper. I've never seen one that was thick right in the middle, though some have legs on the sides. The middle section is normally thin. I use the same short needle size all the time with no trouble across many injections.

I noticed the same thing with a recent order and even with longer needles it takes real effort to draw. Here are pictures of the caps from those vials.

Are you sure the needle is going into the inner circle on the stopper? Here's a picture of the underside of one, which can differ by brand, showing where the problem occurs if you miss the right spot.

Solution B is a really bad idea. Used vials should be discarded. Not worth the infection risk from contamination. If transferring at all, a fresh sterile vial would be better but still adds some risk. Also what gauge needle are you using? Higher numbers mean smaller size and make it harder to hit the right spot on the stopper.

I've had trouble with one specific item from my source. Every bottle of that type is hard to hit dead center so I often catch the side. I made a custom cap with a small center hole and it helps a lot. Oddly everything else from them is fine, only those particular bottles have the issue.

Some needle brands seem much better than others. Certain ones I've tried work well but the recent ones bend if you look at them wrong.

Awesome, that fits the bill perfectly. I'll get one printed up this evening. Appreciate it!