please help with option

A quick learner from Crofton Md says:
I need the S 385 27 bal. but don't know which option to order. Stamped on side is 26 4 CALDWELL DM
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Tom from SWISCO responded:
Thanks for posting! Based on your stamp, I'd recommend the 2640 option. This can carry a window sash weight range of 19 through 26 pounds. Does your sash's weight fall within this range? Double check and let me know!
A quick learner says:
Thats what I ordered thanks for your help. I been working with the broken balences for years until I found your site.
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