sash weight & flow balancer

A home owner from florida says:
non tilt sash S351-22 flow balancer.stamp no balancer is 21-12 BSI.Sash weight is 50# ?. what option do I need for correct spring? thanks Mark,
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Tom from SWISCO responded:
Good morning, Mark. Thanks for posting. Can you please confirm the weight of your window sash? 50 pounds is a lot for a 22" channel balance. Can you also confirm how many balances are used for each sash? I would also like to know how many springs are in each channel. If your sash is, indeed, that heavy, then we may be working with a custom set up, and I will need more information.
A home owner from FT. MYERS FL. says:
this is a heavy window and the spring looks to be a double spring. a spring inside of a spring. and channel on each side of the window of course.
User submitted photos of a window balance.
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Tom from SWISCO responded:
Thank you for your patience in this matter. We may have found a possible match, we just need a little bit more information. Can you please send me a few pictures of the clip at the end of the pulley string? That should be the last thing we need. Thank you!
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