34DS 42 And 2790 31

A contractor from Burlingame, CA says:
March 4, 2019
The window this 34DS 42 weighs approximately 42 pounds. The width at the rivet is 9/16, which I think you call 1/2' channel. The appears to be the letters B.S.I. sideways between the 34DS and the 42.
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Tom from SWISCO responded:
March 6, 2019

We can replace this balance, but it will have to be a special order due to its configuration and spring strength. Specifically, we will be making a 35" long channel balance with a 19-011 top fitting and 15-001 bottom fitting. This will also have a 34DS42 stamp option for your extra strong spring.

Before we begin, can you just tell me how many you need? Once I know that, I'll email you an order link and price quote for the requested quantity.
A contractor from Burlingame, CA says:
March 13, 2019
Need a quote on
8- 34DS 42 35" length window weight 42 lbs.
2- 2790 31 28" length window weight unk. Visible window size that shows is 42.5X27
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Tom from SWISCO responded:
March 14, 2019

Thank you, I'll email you an order link and price quote right now for 8 of those 34DS springs.

As for the 2790, does this use the same 19-011 top and 15-001 bottom? If so, can you tell me the exact weight of the sash?
Channel Balance Shoe, 1-1/8" Depth
Channel Balance Shoe, 1-1/8" Depth
15-001
$0.74
Channel Balance Top
Channel Balance Top
19-011
$0.97
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