Looking on the site I can't tell if I'm seeing different options for this 28" block and tackle channel balance or if I'm seeing the same one in different product categories .
28" balance with markings 2740 MK BSI. Goes to a massive two window Windsor 78x58 from early 2001.
Spring side is 1/2" wide. The other side is around 19/32" I think. My eyes don't work like they used to!
Thank you so much!
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Jasmine from SWISCO responded:
February 27, 2024
Thanks for posting! Your channel balances are either the S351-28 with a 1" shoe or the S390-28 with a 1-1/8" shoe. These balances are assembled with wingless top guides and wingless bottom shoes. To determine which series is needed for your window, look over the dimensions from the diagram below to confirm the depth of your bottom shoe. You'll need to select the 2740 stamp option. 
Comparison of the S351 and S390 balance shoes.
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