Searching for 2950ofbs1 channel balance replacements

A quick learner says:
stamp 2950 of bs1 30 inch long channel is 1/2 inch
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Casey from SWISCO responded:

Take a look at both our S380-30 and S385-30 channel balances. Depending on the 'depth' measurement of your bottom balance shoe will determine which of the two balances would make the best replacement. Whichever one chosen will go with the 2950 option that holds up a sash weight of 28-32 pounds. 

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