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Shaft Collars
To avoid using a spacer, I would suggest that you look for a shaft collar. If the axial loads are too great to be held by a shaft collar, then my next choice would bve to use the Al tubing. If you cut it to a rough length, you can file it to the right square length. This does take some time, but taking shortcuts doesn't pay off with drive systems. As for the PVC, if you use Schedule 40, it will probably be OK. It is good under compression.
Hope that helped!! Good luck!
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