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there will always be issues that pop up... 5/16 square stock is available..... I've also used some in the form of key way stock on some of our big exhaust blowers....
My rotissary motor had a 5/16 sqare drive ... that fit over the drive motor... I through bolted the drive to the motor, I turned the opposite end round ( 1/4") and fitted it with a flex coupling.. this solved alignment problems..... from there it's all belt driven..
for me.. I have as much fun building jigs and tools to aid the job as i do building plugs...
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