I have chucked more than a few nipples in a drill to thin or refurbish. half the time to turn down the peening, and half to thin for small caps. I got a sleeve of a thousand #10 caps a few years back when nothing was available. (probably just after the last election) and remember turning down a bunch of nipples. now Im on to a sleeve of #11's and they all work fine on the same guns, still using those refurbished nipples. I bought a few used sidelocks, and there were some that must have been dry fired quite a bit or something. some must have at least several hundred shots again on refurbished nipples, and look better than before I turned them. I dont remember ever even using a nut. usually you can chuck them past the threads on the body. I now have plenty of replacement nipples, but the old are still working, so the stay in use.