You could machine a groove and use a snap ring on the end
axle is flush or below flush....I would prefer to run it as wide as I can which puts the axle about 1/2" below flush.... :shrug:
how about two inside and out with a spacer on the inside. Still doesn't solve the wheel spinning on the axle when power is applied, but it would take alot of stress off the set screw.
there are eccentric locking collars which engage an eccentric hub on the bearing casettes....these lock the axle from moving left to right and they are very strong as per Steve Durhams reccomendation...I wish I had something similar for the wheels...
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