Garret, I have run into many "squeaky" Mason Hamlin pedals that have ultimately turned out ot be the damper lift tray hangers. Try removing the action and moving the pedal up and down several times while applying pressure to the SIDE of the damper lift tray. In other words, try to move the tray left and right while engaging the pedal. If your squeak disappears, you've PROBABLY found the problem. Try lubricating this bearing (McLube or ProTec "CLP" has worked for me). As an afterthought, there is a small leaf spring under the loud pedal that can cause problems also. It is possible for this spring to develop a small crack which can cause a squeak. I hope this helps!! Brian De Tar, RPT
This PTG archive page provided courtesy of Moy Piano Service, LLC