SWISCO - The Replacement Hardware Authority

Channel Ballance Replacement, Which One?

A handy person from Jacksonville, FL says:
I have 9 windows in my town house with broken channel balancers. I removed a set from one window and have attached the photos of each end and of the only marking available (UB 28D)

The channel (without end pieces) measures 29"

I'm hoping that you can tell me which i need to order from the information I've provided.
Much appreciated
Steve
User submitted image of their window hardware.
A handy person from Jacksonville, FL says:
PS If it's at all helpful, the springs measure 15"
Profile picture of Paul
Paul from SWISCO responded:
Hey, Steve. The balance manufacturer who made your hardware has gone out of business, but you should still be able to use our S380-29, which comes with a 19-005 top fitting and 15-005 (1" depth) bottom shoe. Please compare this hardware to yours to confirm. The spring weight option would be 2840.
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