26H option for S796-26

A contractor from winston salem, nc 27104 says:
26" Series 795 Channel Balance looks to be what I need. What I am replacing is stamped BSI 26H. The window sash is very heavy. What would I need for this application?
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Tom from SWISCO responded:
We may be able to custom make something for you. Can you just confirm the exact weight of the sash? Can you also tell me how many you need?
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