Here’s a small box tool, meant to use in a turret but I sometimes stick it on the carriage in a boring bar holder. Bigger ones can have things like screw adjustable roller supports and retracting cutters.
https://babel.hathitrust.org/cgi/pt?...iew=1up&seq=63
I’m terrible at setting mine and would have a much easier time with a tool with guide bushings like yours. Nice work and thanks for posting it!

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