Why spend £50 when you can make your own…
Ground an M10 bolt for the first one…
Filed then Water stones; 220, 1200, 8000…
Turned a handle, screwed it in…
More or less the same with the next two.
Hefty thread cutter made from a damaged F Clamp bolt, ground flat with an angle grinder, welded into a recess cut into another bolt, cut to size and threaded into a turned handle…
They’re on the shelf above the lathe, pictures of threaded boxes coming soon…
The recess cutter is used when turning the female thread, doubles up as an arm extension also…
Should be used at 450rpm, though I did manage to cut a thread at 1150… so who knows, find out what suits you…, ask me to show you the technique when you see me…