On the M35Cdn (MLVW) the shields would often be lifted up to be able to pull back the rubber and check for how much leakage was occurring. The shields would be bent back down, but of course they would never go back to the original position. They would then get rubbed by the drum, and occasionally could separate. An instruction came out a decade or so ago to simply remove them. Not having them did not seem to make a difference.
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