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That was kind of what I had in mind. I originally bought this https://www.diy.com/departments/3-8-x-16-unc-imperial-tap-repair-cutter-kit-helicoil-damaged-threads-14pc-kit/5056133359053_BQ.prd but the thread in the wire inserts didn't match the bleed valve so it was useless. I was hoping...

I have a cast iron radiator in my new home with a brass 3/8 bleed valve as shown in the picture. The problem is the thread in the radiator have been stripped and the bleed valve doesn't tighten. I have tried a new bleed valve with ptfe tape but the bleed valve just turns in the hole without...