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What is the difference between Single Shouldered and Double Shouldered bushing cauls?

April 26, 2017bushing cauls double shouldered

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What is the difference between Single Shouldered and Double Shouldered bushing cauls?

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The single shouldered cauls are specifically made for the two caul method. Being flat on one side, they can be used for making “flush cut” (no shoulder) balance rail bushings, as most pianos have, by inserting with the flat side toward the cloth you are installing.