Ecco channel balance 2666 Bsi

A professional from Baltimore Maryland says:
Hey I have a bunch of these balances and it's very hard to open or close my window I'm looking to upgrade the hardware
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Bob from SWISCO responded:

This looks like either an S351-27 or S390-27, depending on the depth of the bottom nylon shoe. Compare both with your old hardware to see what matches best. Your old stamp option is a bit unusual; to know what new option to pick, obtain the exact weight of the window sash. You can then match that exact weight with one of the weight ranges listed alongside each stamp option on the balance shop page. 

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