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Old 10-19-06, 12:22 AM
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The problem with the soda-can shims is that you have multiple layers of a smooth-surface. This spreads out the total-friction across multiple-layers. One of those layers may have slightly less friction than another and will slide first.

A single purpose-made shim with serrated surface will grip much, much better. Bike shops usually have these by the tonne...
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