Recently had a problem with an internal finisher not stapling the paper correctly. It couldn't pull the paper back in to jog it properly before stapling. The conveyor belts (this is what the manual calls them) were not making good contact with the paper. There are these white plastic "holders" that have to be trimmed or filed in order to improve the belt's contact with the paper. After trimming these holders the problem was solved. Hope this helps anyone who may be fighting this issue.
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