RE: Cox cylinder/head tap
I think we are on the same page Bruce. The drill rod is a bit harder to get a clean cut that small though, so I'm still figuring that one out. I did cut a female thread in aluminum single pointing..., and it turned out pretty well. I'm considering doing this and then having a sleeve press into the case after threading so that when I cut threads it will he l be a through hole with a open space behind to make it a bit less tedious. Looks like James engine is out of the taps so I'm gonna have to figure it out this way....what kind of tool do you think you would use to make this cut? HSS or the small carbide I'm using? Its a shame a old Cox cylinder isn't harder or I would consider splitting it and using a plug to stretch the OD a bit. Todd