Grolsch-style rubber washers are great for holding leather straps to a guitar strap button, but they're too big in every dimension (especially thickness) to fit well on a mandolin strap button. Landed on these cheap neoprene washers (7/8" OD X 3/8" ID X 1/16" thick) which work perfectly on a mandolin. Nothing earth shaking but it has improved my mandolin life, maybe it would yours too.
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