They would only work for rear trunions where you can get to the inside of the trunion like we do with the front. I know SOME rear runions you could use this to do one of the two holes but most reat trunions use the long rivets and they have solid trunions that run with width of the receiver.
I made up 15 of the tools tonight and I am going to see them for $10/each + $2 for shipping CONUS. Ends up I lost about five more because of issues with drilling and/or tapping and the stainless steel is pretty tough on the drill bit and tap. I also had to pay a little more for the little tweezers then I had planned...
here they are if you want one:
http://www.quarterbore.net/forums/showthread.php?t=698
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