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I was thinking that a compressible washer would act like a lock washer. But why not use a lock washer under the screw head, and a nylon washer between the disk and wheel that has a small enough hole so that the screw thread cuts into it? Then when you take the disk off the screws would remain in place.
I think the bigger problem is not the screws loosening; it's when the wheel flexes the screw cuts the hole bigger, until the whole thing falls off.
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