385 channel balance

A contractor from florida says:
November 9, 2016
My sash balances are stamped with 29 6 dpBSI. Any idea which one I order for replacement? Is it the 2810?
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Tom from SWISCO responded:
November 10, 2016
Thanks for posting. If your stamp is 29 6, then your balance should be 30" long, not 29". I would double check that. I would also recommend the 2960 option, since your old stamp reads "29 6."
29" Series 385 Channel Balance
29" Series 385 Channel Balance
S385-29
$11.10
30" Series 385 Channel Balance
30" Series 385 Channel Balance
S385-30
$11.30
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