All knob set screws must be checked to be sure they remain tight. Lever type knobs like the shutter release utilize a big set screw with a vinyl cap. A small slit can be cut in th end of the vinyl cap so hex head wrench can be inserted. Set screw must be tightened on the flat of the shaft.
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The tray mounting blocks in the bottom of the housing have a stamped hard rubber surround glued to bottom of housing to prevent the nuts from loosening, but we suggest checking that the nuts remain tight.
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