Paul from SWISCO responded:
October 31, 2014
It sounds like you have our Series 750 or Series 751 balances, but I cannot say for sure based on this information. Take a few pictures of your parts and we will try to help from there. Unfortunately, we don't have a service man in your area. You should be able to find one in your local Yellow Pages.
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Paul from SWISCO responded:
November 3, 2014
We do have a video on repairing your type of window. I've posted it below for you to watch. You can just replace the broken balances for the bottom sash, but you will have to remove the two sashes with the track to replace the bottom sash balances.
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