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A handy person from Elkridge, Md 21075 says:
March 21, 2012
2830 channel sash balance 29"

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User submitted picture of 2830 Channel Balance.
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Paul from SWISCO responded:
March 22, 2012
Please take a look at our S371-29 channel balance with a 2830 stamp option.
29" Series 371 Channel Balance
29" Series 371 Channel Balance
S371-29
$11.10
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