I have a 1911 A. B. Cameron upright, (given to me). As part of my continuing education I am doing various projects that I get to see the immediate and long term effects of each project. I tightened up the plate bolts and screws, (the ones behind the strings were the loosest), and what a difference in the sound. The tubby sound all but dissapeared. However, there is a stud that comes out of one of the back posts, through the sound board (not attached to), through the plate with a large square nut on it and no back up nut under the plate. This is located below the hitch pins for D5. There is also a screw that does the same thing on the post to the right and is below the hitch pins of note B6. It appears to me that this might affect the downbearing on the bridge and the tension of the soundboard. What is the purpose of these, and how do I adjust them? Should I rely on my mechanics wrist and elbow function that tells me when it's tightened to the max torque just before failure? Thank You in advance. Keith Roberts Associate PTG
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