Metal tuning pin bushings do not work, I have tried them once. Wood veneer works well if you use walnut or mahagony. Maple, rosewood, beech and other tryly hard woods do not squish enough to get a nice fit. My initial reaction to using soap was no way, but it would be an interesting experiment. If I pulled a tuning pin to soap it, I would use a sandpaper shim, with sand agains the wood or a wooden shim instead. I would be concerned about contaminating a useful block further down the road. Newton nhunt@rci.rutgers.edu
This PTG archive page provided courtesy of Moy Piano Service, LLC