Circa 1989 Viking single hung window

A contractor from Vacaville says:
Looking for replacement sash balance complete assembly. One window has two 2840 balances. One window has two 2830 balances
Channel Balance
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Tom from SWISCO responded:
A wingless bottom shoe and a winged top guide belong to the Series 395. The length for both balances should be 29", so check the length of the metal bars, not including the attachments.

Your S395-29 balances should need a 2840 stamp and a 2830 stamp, respectively. You can (and probably should) double check the option by weighing your window sash, which should weigh 16 to 23 pounds (for the 2830) and 23 to 28 pounds (for the 2840).
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