Twister T-ZERO, Maintenance And Cleaning Manual

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5. Turn the tumbler motor on, and ensure there is no grinding or other noise.
The upper radial rollers should not rotate continuously with the
tumbler. They should only touch briefly at the high spots.
6. Confirm the Upper Radial Rollers are set at the high spot by rotating both
tumblers by hand. Each roller should only touch briefly at the high
spot, then be stationary for the rest of the rotation . If a grinding noise
is present, raise the Upper Radial Rollers. Repeat the process in steps 13
and 14 with a .02” shim.