stamp on channel

A contractor from San Diego says:
September 2, 2017
my stamp reads 26c
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Tom from SWISCO responded:
September 6, 2017
If your stamp says 26C and you're positive that you need a Series 385 (which involves making sure your bottom plastic attachment matches the 15-004 and your top matches the 19-005), you probably need the 2630 option (C is the 3rd letter). Verify that by weighing the sliding window sash. For a 26C/2630 stamp, it should weigh between 13 and 19 pounds.
27" Series 385 Channel Balance
27" Series 385 Channel Balance
S385-27
$10.55
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