SP20 Drum cam damaging cylinder?

I noticed that the drum cam (especially on the non-operator side) is looking worn. There’s corresponding wear on the cylinder. Does this indicate I need to adjust the screws on the support arms per page 11 in Paul’s book? If so, I’m a little unclear what screws I should be adjusting.

thank you!

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The Arm
1 year ago

There shouldn’t be any significant resistance in getting past this tab so I think you are right in being concerned. Now that everything is together and moving, you might want to revisit your eccentric adjustments.

The Arm
1 year ago

This is not on the working face and not on the cylinder bearer, but in the space between them. It seems a bit crazy, but I think this is just what these do. Does anyone have an SP-20 that doesn’t have an impact blemish in this spot?

DGM

Paul Moxon, Moderator
Admin

I wonder if it might be better to patch the wear on the cylinder, then reshape the cam and shim it up.

Paul Moxon, Moderator
Admin

Loosen horizontal set screw “A” and then turn height screw “B” clockwise to lower and counterclockwise to raise.

SP20.drumadjustingscrews.jpg
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