You can get special files for cleaning up threads. They work with any thread of the same pitch, regardless of the diameter.
Also, here's a link to a similar thread.
http://forum.pafoa.org/rifles-42/121...ml#post1453319
I'll quote it here for the benefit of those who don't want to follow the link:
Admonition:
- Be careful.
If you use the steel locking ring or a normal tap or die (or what is called thread "chaser") to clean up threads, you will likely cut away the metal that is outside the parameters of the normal thread (in other words the bent part of the threads). This tends to weaken the threaded joint. Would it weaken it to the point that it fails? No way of telling.
While the above may work, and work safely, If you really wish to do this job correctly, you should use a special tool called a thread restorer or rethreader
What the restorer will do is, as it is turned along the banged up or bent threads it will push the metal back into place instead of cutting it off. In this way you are left with correct threads that are not weakened as much.
http://www.sears.com/shc/s/p_10153_12605_00942275000P?cat=Hand+Tools%252C+Gen eral+Purpose&pid=00942275000&vertical=TOOL&subcat= Bolt-Out%252C+Taps+%2526+Dies&BV"]Here's a link to a set that I own[/URL]:
I hope this makes sense to you. I don't wish to make things seem more complicated than they are.
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