This is a list of things I have used while piercing and nailing my cock and ball sack down. I have yet to put a needle through or into my balls but I have through my glans. My ex wife pierced my frenum about 30 years ago and before my meatotomy, I had a prince albert that I had done myself about 20 years ago.
Here is the list:
Sewing pins
Push pins
Tack nails
Finish carpentry nails
Carpet tack strip
Safety pins (diaper pins)
Sewing needle and thread
Medical syringe needles