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Check and see if the guide piece is loose. It looks like it is too far inward at the rear edge. It can be shimmed with washers. It is held on with a couple of bolts from the inside, they often come loose and sometimes fall out, possibly the bolt was replaced without enough washers between the frame and guide/seal piece.
I might also have a copy of the top manual,it's in PDF format so it can be e-mailed if you like.
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