Aluminum Window Balance has Broken

A home owner from California says:

June 21, 2021

Good morning Paul;
Spring balance on single hung aluminum window on one side broke, I like to replace the balance on both sides:
Length in channel portion of of balance 29 inches
The bottom movable panel weighs 22.2 pounds
Stamp on old balance reads 28 3 JK Caldwell
Width of channel on backside 1/2 inches and front side where the spring rests lip to lip is 5/8 inches

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Bob from SWISCO responded:

June 24, 2021

See our S351-29 or S390-29. The only difference between these two channel balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement. The diagram below shows the difference. In either case, for a new stamp option use our 2830.

Comparison of the S351 and S390 balance shoes.

29" Series 351 Channel Balance

S351-29

$11.10

29" Series 390 Channel Balance

S390-29

$11.10

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