Your typical cheap tap and die set is basically "thread chasing" quality
, made of relatively soft steel with marginal sharpness.I keep an old M6 tap with the end ground back, on a tap wrench at the work bench.
PS the rear hub has threaded steel inserts for the sprocket bolts cast in.
Yabbut? Kind of creating a minefield for some unsuspecting future rebuilder?
Anyways a moot point now, I went at that valve again with MUCH better
Used one of those little diamond wheels, really worked well. Like @Jim I think you could do it in a dremel mounted to the cross slide
The diamond disk shows little wear, paper towel protecting the ways shows metal ground from the valve face.
Lapped in
Holds solvent no leaks now.
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It's at least partly about messing around with the (new to me) tool post grinder.
