Intake Falling Out

So I’ve figured the easiest way to have my intakes rotate is to have it on an axle and motor. However, the intakes are too heavy and tend to fall out. I have rubber locking collars on the shafts but they seem to just slide down. Any suggestions (I have already reduced it size by 1/3 in order to cut weight)
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  1. reduce weight where possible
  2. Use shaft collars if you weren’t before
    3)More shaft collars

Hope this helps if not, ignore me


Clamping shaft collar, my dude.


Yeah, the rubber collars aren’t any good and I have yet to find a decent application for them other than as weird spacer things.