Annealing just a section of a arbor ?

Finally had some time work on this idea , the threaded end isn't very hard , a file could make marks . Looking closer the metric threads are very close to 3/8"-16 slightly larger but you could thread about 1/2" in without binding I thought I would try just running a tap in to see how well the fit was . My way of thinking is I don't torque the drawbar down that much anyway and seems the holding power is the MT2 figured it was worth a try . I'll make some test runs on some scrap pieces first . I didn't mention but it's for a 2" boring head
 
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