Noticed that some of the responders in this thread are looking for a quick retract/reset tool holder for threading. I don't know of any new suppliers, but Kits are available:
Quick retract/reset tool holder for threading
(UK)
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(US)
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Also for the person looing for a way to slot some lather parts.(UK)
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I don't think I'd want to use this for production, but may be of help for one-offsEnjoy
GmcD