Onesti Balance Hole Repair http://www.onestipiano.com/pages/bhrs.html#anchor525541 You don't always need it but when you need it you need it. Aside from doing a complete set, sometimes relocating the hole is better to square off a key than excessive bend of the pin. Maybe not so common in institutional work but in my retail turnover it comes in handy. -- Regards, Jon Page
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