After having the old felts removed as outlined in my last post, It's time to install the new felts. The sizing cauls are removed, and clamping cauls are chosen to match the thickness of the balance and front pins. In this piano they are both .146". Next, the proper thickness of felt is chosen to achieve a finished bushing that is neither too tight or too loose. Finally the felt is glued into the mortise one side at a time, and then left to dry overnight. When the cauls are removed, the new felts are lubricated, and individually fit back onto the key frame to assure that the fit on the pins is correct.
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