1" to 10 mm boring bar adapter

[Frank S]

I like this idea of making a collet to fit in the boring bar holder. Curious why you would not use the 250-201 holder for holding what appears to be an internal threading bar.
That seems to be the way I end up holding these smaller shank tools. For round, I use the 250-202 holder with the groove machined to trap the round shank.
I have the small 100 series for my 10x24 lathe, and the 400 series for my 18x40 lathe. I have run out of adjusting range (for tool center) on that larger size QCTP system for very small diameter shanks.

Actually I reground a triangular insert to be used to make a snap ring groove. I have a limited number of the 201s and always keep them loaded with square shank cutters. Not even sure if any of them might be 202s instead of 201s it has been so long since i have removed the cutters from them.
This collet adapter fits in the holders I have for 3 of my lathes 1 being a CXA 2 being BXA tool posts
In my original post I wrote it as a BXA but in looking this morning that holder was actually a CXA.
with the number of lathes I have it is sometimes easy to mix up the numbers and sizes of the tooling.
I don't do much internal single point threading any more and almost never any internal threads on anything under 1inch. I just don't have the patience for the fiddly little flexible shanks. Snap ring grooves in a 5/8 inch bore try my patience enough.