Replacement channel balance stamped 2820

A home owner says:

I took pictures of the parts I have. The number on channel balance is 2820 and the part measures 29"x 1/2". I need all replacement parts for 4 windows and instructions on how to do it. 

Thank you JIM 

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Paul from SWISCO responded:

Hi, Jim. The balance manufacturer has discontinued the screw on balance shoes and are now replaced with a 15-002 bottom balance shoe. You should be able to go with our S370-29 channel balance with a 2820 option. 

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