Paul from SWISCO responded:
September 27, 2017
Thanks for choosing SWISCO.com. Please compare the dimensions of our pivot shoe 15-067 to yours. The balance looks like our Series 770-26; however, we need to know if there are any stamps or engravings on the channel to determine the spring strength you need. Can you please send us a photo of the stamp if you see one? If not, you're going to have to weigh your sash on a scale.
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Paul from SWISCO responded:
October 3, 2017
Thank you! I still think our S770-26 is the best match, though your stamp indicates an incredibly strong spring. You may want to weigh your sash to confirm. Our 26E may be what you want; this can carry a sash weight of 26 through 30 pounds.
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