As I recall from reading somewhere (perhaps the Journal) the underlever should be straight out horizontally when the key is fully depressed. So the height of the pivot pins should be adjusted to achieve this. I think it would be counter productive to have the key lift the underlever beyond horizontal. Also, the key end lifter felt height at rest should be around 1 3/8". This will result in the underlever rest position to be about 1 1/2" above the key bed. So approximating with 1/4" damper travel at the front end, figure pivot height from a horizontal underlever at 1 3/4". I haven't tried this but it is where I would start and fine tune from there. Sand the bottoms of the underlevers smooth on the ends and area over the tray lifter felt (if accessible), and coat with McLube 444. Brush teflon powder onto the key end felts as well. I've seen/felt some very rough surfaces causing excess wear. Regards, Jon Page, piano technician Harwich Port, Cape Cod, Mass. mailto:jonpage@comcast.net ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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