As finnspinn said use loctite 648 to glue the bushing into the frame. I built a complete unicycle frame with loctite and it held up quite well. Post a picture of your unicycle(s) - #273 by ernst
Another option would be to cut the bushing parallel to the Rotation axis. Then you could bend it a little bit so that it fits tight to the bearing.
If you don’t want to cut the original bearing, you might find aluminium tubes 8mm x 6mm to cut bushings from it.
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