[Shop-talk] adjustable thread dies

[john niolon]

Help machinist and mill wright type people
 
I have a output stud in an alternator case that the beginning threads are 
stripped/galled/messed up from someone trying to force a metric nut on it.  the 
stud is about

 5/8"  long and the majority of the threads are good.
 
I can't seem to get a 12-24 die started so I know it will true up the existing threads.   I see they make adjustable dies on the net... can I use that to slide over the bad threads  
 
the adjust the bolt in the die to sit right on the stud then thread it back over the bad threads ??   I just hate to send 20 bucks for the die if it won't do what I want...
 
Any experience doing this ??
 
thanks
john
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