IMO clamping on a M8 shaft will be more than enough. If all you have is a block of aluminum, band saw, and drill press then you can make a pretty decent coupler. Additionally there a few compounds that are meant to lock the shaft and the coupler together. I don't use them because with a prototype you never know what you have to change in the future. Keep in mind that the torque requirements are actually not that high. The size of the screws is for rigidity. (I am referencing the mega LISA talk.)
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