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Good idea. I had been considering a clamp/screw combo. Think it matters what kind of thread?
I've already epoxied it back together.
Version 1.1: I roughed up the inside of the shaft bore, applied a liberal amount of 2-part epoxy and put the shaft back in. The thought being: "make your own internal splines!" (C).
It lasted a little longer, but the epoxy sheared inside the coupler and it spun merrily around the input shaft.
It worked almost long enough for me to be sure whether a 1:1 motor:input shaft ratio at 24v will be enough for what I want. But not quite!
So I can adapt the coupler one more time and test again.
Also: if I'm willing to ditch the motor's commutator-end fan, I can turn the motor upside down and use the the external shaft instead of monkeying around with that little pump shaft and its weird interface to the motor.
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