another tip...if I may? I recall Fred mentioning "sanding" let-off buttons, and he may/may not have mentioned this: Steam the cloth (not so much as to remove them though!) with damp cloth and iron, then press hard with the dry warm iron. The SD-10 I tried this on had soft/spongy cloth, and if I recall, the punchings went from 4mm to 3mm, and are firm with a clarified shape, but not hard so as to produce noise. Again; old part / new characteristics Mark Cramer, Brandon University BTW Tim, who "won" the Knabe lottery!!?
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