I use a tool sold by Helicoil. It is just a flat blade sharpen on an angle to dig into the first thread. Easily home made. Just grind the angle(10 degrees or so) so the edges dig in when rotating ccw.
Dick
Mononeuron (Aug 4, 2017), Scotsman Hosie (Feb 21, 2018), Stokestack (Feb 12, 2018)
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