Another aspect is action elevations. A few years ago in the Journal was an article addressing this. Recently, on a M&H, I was having a heck of a time getting the action to regulate satisfactorily. I noticed that the jack to shank angle and wippen inclination was not ideal. After raising the wippen rail 3mm the action behaved. The distance between heights of the hammer and wippen centers is about 6.4cm. Check you key elevation as well. The frame cloth may have been changed with wrong back rail thickness or was wrong from the factory (!?). -- Regards, Jon Page
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