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Why would you want to use a the adjustment feature of a set-tru chuck when the TBAS itself has a set-tru feature built in? The aluminum hub that I made for mine was 2 1/4-8 tpi on one side and a close tolerance fit on the other side to accept the recess in the 6 jaw to keep the back plate in...

Here it is... Finished pruoduct.. JS

Have you made any mods or additions to the TBAS? I made an aluminum alignment hub as an interface between the back plate and 6 jaw chuck that helped out a great deal. I wrote a lengthy review of the TBAS over on the AccurateShooter forum. The bottom line is that I like it very much. JS

It's an expensive option, but the True Bore Alignment System from Straight Shot Gunsmithing is like the Cadillac of apparatus for truing actions and threading short barrels. JS

Thanks Keith! JS

Hi, I'm brand new to this particular forum and stumbled on this thread. I perform this modification on AR15s and AR10 a few times a week for customers. The most important thing that I can recommend to anyone is the use of a carbide tap and all tooling when performing the mod. The use of HSS...