I purchased a $20 crimp too from Amazon that has a small hex that is supposedly for the center pin to my BNC Crimp connector to RG58. The size is .068 for the small hex. Every time I try to crimp the center pin to the center conductor of my cable, the crimp tool obliterates the center pin. It works fine for the ferrule. Is it possible that I just have a bad batch of center conductors? Any tips as to what I'm doing wrong?