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(just guessing here)
If the contact is in the center, the drum is probably too enlarged or worn.
When they get thin those can crack if overheated.
If on the leading or trailing side, the pivot hardware or piston may be worn.
There is usually an adjuster accessible with a flat screwdriver through a slot I think. Lube joints first.
Read backing off instruction specs.
Or the mfr may make them undersized to be used only with their own thicker or smaller diameter drum.
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