If you screwed up the crank threads or mushroomed out the face of the shaft,just use a thread file that you can get from any auto supply. Either 1.25 or 1.50 pitch on the shaft itself.

 

 

I've heard people refer to thread repair files as thread chasers but those are something else. Outside Thread Chaser: Automotive Tools & Supplies | eBay

There have been times I needed to file some threads but didn't have a thread file. Three square (triangular) files aren't really a narrow enough angle, but knife files are. They always put them in sets of needle files. There's another kind called a slitting file that will work too, but small sets probably won't have them. https://www.gesswein.com/p-9897-grob...les-knife.aspx

 

Thread files do work but you have to be patient.The pistol type from Otc looks like a good product.Guess it depends on what part of the county you're in as to what you call things. Mention thread chasers to me and you get one of these. I've got several of these in the tool box.

 

I saw those when I was looking for a picture of an outside thread chaser. Whenever I had a problem with inside threads I just tapped them with a tap and die set. I never used thread chasers for inside or outside threads, but have used a thread file, so I at least knew what those were.

 

Threads chasers are ok for threads that may have a nick or two on the threads. Had to use one on the #2 plug hole on my old Honda 750 and also one on an old 82-83 Honda 650 at the shop. Common plug for a lot of people to have problems with because of its angle no matter even if you finger start it like the other plugs. Just have to have the chaser loaded up with grease same as you would a tap.When it concerned heads I didn't like having to use either one while it was still installed. I didn't breathe easily until the plug was installed and the engine running ok.

 

 

The pic can give a better idea as to what you've done. As far as the BEST way,a die is the best way.I can't remember off hand what size and pitch the crankshaft threads are though. Even better if you have a machine shop or good auto shop close by. They shouldn't charge much to clean the threads up.

 

 

Glad y'all are able to do things together. I hate basketball,the wife loves it. She's got the tv watching the college playoff now. I'm stuck with the desk computer. Can't even run her off to the bedroom tv.. Such is life after 47 years of "blissful" matrimony..