Solution? Orthopedic Ligature Bands
went to 2 dentists today... they didn't know what the units were
Yeah I've come to realize the title for this thread is completely wrong
They are really called "elastic ligatures/bands/elastics". They are used for braces
I've even found some places online where you can order them
You're right, they DO need some wiggle room, but sometimes they have TOO much room and they slide WAY too much. Hopefully this will restrict their wiggle room but at the same time leaving room for some wiggling.
When I was doing a lot of customs with wheel and axle swaps I would glue thin pieces of plastic strips to the sides of the chassis to to cut down on the amount of play in the wheel. Local hobby stores sell different sizes and thicknesses of the strips. I didn't race my cars back then but I always hated seeing a custom where the end of the axle extended way past the face of the wheel. You could also try cutting up small pieces from an old CD case which is a little thicker plastic. Put a notch in it for the axle before gluing it in place. I would think there'd be less friction in case the little O rings are more of a rubber material.
Something I've used with a little success is a plastic antenna tube for a R/C car. You can pick em up at any r/c hobby store, super cheap, cut them any thickness you need, then simply snip/cut the tube/spacer length-wise and it will open just enough to put onto the axles but very unlikely to fall off. If my explanation needs picks, someone let me know.
went to 2 dentists today... they didn't know what the units were