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?


Paul Moxon, Moderator

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

Last edited 1 year ago by Paul Moxon, Moderator
Paul Moxon, Moderator

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

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