The tool you’re referring to is called a tap and die set. Taps are used to cut threads in holes, dies are used to cut threads on metal bar stock to make them screws. The problem is you need to know the thread pitch and the thread count, and also whether metric or standard. I would guess that’s metric but that’s where my knowledge ends. Find a local machine shop, that’s what those guys do.
having said all that, it’s typical for the early threads to be shorter so they can begin to engage the threads on the nut properly. Nothing about that looks stripped to me. Furthermore, the eyelet that screws in to is brass, a much softer metal, this is by design. The eyelet will strip first every time. This saves the end of the stick from cracking. It’s fairly easily replaceable you just have to get the height right so the frog glides on the stick nicely.
So the real question is, what is the real problem? What problem are you having with the bow that you think this is stripped, if it’s not tightening it’s very likely the brass ferrule that’s stripped. Cheap fix. Cheaper than a tap and die set. But that’s still a symptom of a bigger problem, why are you tightening it tight enough to engage the safety features? Was it a one time boneheaded mistake or do you need to to do that everytime? It’s likely your hair is stretched and you need a rehair. Or the hair is too long….I don’t know, take it in to a pro, your bow needs a look by someone who knows.
