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Paul from SWISCO responded:
November 15, 2016
It sounds like the gears are a little worn out, so it'd be a good idea to replace the operator mechanism. Now, the numbers you gave us aren't the best method of identifying a match, but you could start by looking at our 39-155 and 39-156. These may be what you need. I highly recommend going over our pictures and dimensions to confirm that everything is the same.
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