What is this tool thread? Take a guess. Stump the Toolman!

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Just made this yesterday. It used to be that bolt.
20221126_111752.jpg


20221126_111447.jpg
 
Those look to be the cleats of the portable cylinder bore machine? I investigated sleeving a Mazda 1.8 and it just didnt pan out.
 
Could of used one the other day at Tractor supply for a belt for the new old buffalo drill press. They used to have them.
 
I know, I know, I worked at a lawn mower company on the side and used one many times
 
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