One more locking collar thought - Another thing, a single split pin holding the two collars from turning independently would also work. There is virtually no stress on these parts. Just take a 1" bolt with a shoulder and put the smooth bore on the shoulder and thread the other collar on the bolt threads and then drill both of them in place and insert a split pin. I'd say a 1/8" or 3/16" would work fine. Then unscrew the bolt and you are ready to go. I know the collars machine freely. Technically, the ones sold at industrial houses are made from 1215 and 12l14 which means very tough to weld. Some welders won't touch it claiming toxic issues but I'm no expert on welding. I don't know of any plain steel shaft collars (1018). It also comes to mind one could machine a double locking collar from aluminum but it's a lot of processes to make one!
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