If the bushings are not replaced in your piano and later they turn out to provide inadequate support for the tuning pins, it may be too late to make the change, don't let that happen! These bushings are easy to install and solves the problem of loose tuning pins. To use, push bushings into the hole up to the shoulder, and then drive the tuning pin in. The outer surface of the bushing is embossed to insure a firm hold on the pin block.
One bushing is equal to two sizes larger tuning pin.