Eh, his biggest problem is that he's a 14 year old boy. I thought that a discussion after the first one was good enough, but he'll be on closer supervision next time we're cleaning gunsI would not let this person try to remove or install any more nipples. Some people don't have the motor skills to do this simple task properly.
A cross thread is a strong thread!!
1/4 28 bottom tapThanks for all of the advice. I contacted Track of the Wolf just to make sure I was ordering all of the right stuff. I'll try to retap them myself.
Bonus is that this is not likely to the be the last time something like this happens, so I'll have the tools (and hopefully experience) to fix future mistakes
I tried that as the first resort with a stripped drum. Going from 250x 28 to 255x28. Didn't work. Obtaining the correct drill size for 255 made it a 15 minute project. The drill and tap were economically obtained from regular online tool vendors.
