If the die's you have are the type that open enough to fit over the thread fitting it to the thread right by the taper set to the correct clearance &wind the die off rather than trying to start & wind on as with the mushroomed out thread on the crankshaft end the chance of cross/ knackering the thread is increased
dies are uber hard and very brittle, not going to say you could not do that, but I doubt it...they would probably crack beforre you could open them enough to clear the threads, let alone the actual mushroomed part. Now if you had a precision two piece die that would be a different story, but those things are not cheap under any circumstances.
You have thought that I was referring to the circular dia with slot The ones I meant are siimilar to pipe dies & are 2 separate pieces slide apart & fit over part to be threaded set to correct size & turn I have 2 or more sets for restoring threads on aircraft main plane taper pins problem they are to big in Dia & imp thread The Murray one in post 23 is what I"m meaning & at $20 it' a
can you get the requisite reverse thread in that size? if so then yes a little bit of filing to make it easier on the die and then let her rip!... I have never seen any small one that were not special order for a specific task, and they were always expensive, hence my comment.
Uhm tell the friends, coworkers, idiots, (whatever you call them) that my address is 238-0026 Koyabe in yokosuka Japan and I will pay shipping on good XP units that they have broke cranks on....sounds like a match made in heaven
If they are as good as the aircraft ones I have then a very close tolerance & superior to std split circular dies the only point I'm not sure on is do the Murray ones have the same small screws to space the 2 halves apart a minute amount to produce a slightly larger dia thread not a problem as the thread depth can be seen as it has already been formed
