More driving suggests the mods are well worth it: should be more reliable, same speed, less heat, etc. ^

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We have made our own wheels. They work in exactly the same way as blue wheels, with the reverse thread screw locking against the wheel which locks onto the normal thread to hold the wheel on the shaft. The blue wheels sometimes worked their way loose but they were never an issue, they stayed tight 95% of the time. But despite cranking our own wheels down hard, harder than we ever had to before, they work their way loose. Everything is solid, in that it's metal on metal and it's essentially a replica of the blue wheels, but they still work loose.

The tread is just bike tyre, but it does seem to grip our dusty floor better than the blue wheels. The only thing that I can think of is that the added grip means that we're effectively putting more torque through the wheels, and that we've just reached the limit of the standard attachment method for drills? Does that tie in with other people's experiences? If we try tightening more we'll be entering thread stripping territory.

Any ideas? Any old hands got solutions to wheels loosening like this? Going to look into alternate attachment methods. Suddenly, though, we leave in 5 days. Eek!

Thanks.