A shim does exist. We call it a beer can. It would need to be cut accurately to fit all four sides of the spindle end, forming a nice neat bodge.
The obvious solution is to laser spot weld the crank arm to the BB spindle.
@dancing james started
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A shim does exist. We call it a beer can. It would need to be cut accurately to fit all four sides of the spindle end, forming a nice neat bodge.