Broken threads on the QCTP of my compound slide

After many days of studying threading hieroglyphics charts, reconfiguring gears, grinding teeth and breaking belts, and other gymnastics I finally managed to build my new tool post. Thx to many of you who helped this rookie through this sometimes difficult journey. I will now re-tap my compound and maybe make a quick-release handle for it, now that I'm on a roll.
 

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Should I case-harden the threads especially at the upper end where it will be threaded/unthreaded the most? The material used was 12L14 cold drawn steel.
 
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It was fun seeing someone work through the same problem I had. Your solution was a lot cheaper than mine! I solved the problem with the worthless M8 threads by talking myself into buying a real Aloris tool post, and tapping my compound for the 9/16" stud. I mean, problem solved, but that wasn't a very practical decision.
 
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