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I watched that video too - and was about to comment on it after responding to everyone's replies. Yes, it's a good video and is making me feel more confident about this as a solution. Didn't he use epoxy to fix the sleeve? Haven't got there yet, now you've spoiled the ending! Boxford nuts might be more awkward to set up for the boring operation because of the levers but I think the the overall process looks very convincing. It might be handy to have a stub of leadscrew to help centre the nuts for boring. W. Posted by Howard Lewis on 03/04/2021 16:04:24:

I am making a DTI holder from drawings by Stefan Gotteswinter. He specifies that some of the parts should be hardened and, presumably, tempered. These bits (not finished yet) are made from 01 Tool Steel, I am pretty confident I can harden them by heating with a torch then quenching in oil but not so sure how to go about tempering - or if that is even necessary? I understand the principle of reheating and watching for colour change but that usually seems to be done on larger parts where the heat can be applied at one end and the colour change observed as it migrates up the part. These are only...