small window springs

A quick learner from Orlando FL says:
April 7, 2024
What is the replacement part I need to replace bot of these? One attached to the window they are slow to return and do not provide any support to the window.
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Bob from SWISCO responded:
April 7, 2024

Hello there. Is the metal channel, not include the nylon attachments at both ends, 11" long? If so, see either our S351-11 or S390-11. The only difference between these two channel balances is the depth of the bottom nylon shoe, or the measurement from 'heel' to 'toe'. See the illustration below. Compare both balances with your old hardware to see what matches best. In either case for a stamp option choose 1020.

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.
A quick learner from Orlando FL says:
April 10, 2024
That is perfect. You identified the two I need. I will order shortly but first can you help with the second set I need? These are 18" long and the same 1" channel depth at the bottom Photo now attached shows the current stamp
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Bob from SWISCO responded:
April 10, 2024

Sure thing. If the attachments on this 18" balance are the same as the 11" ones, and if the shoe depth is 1", then this is a S351-18, with a stamp of 1710. Let me know if you need anything else. 
A quick learner from Orlando FL says:
April 12, 2024
Thank you so much, I'm about to order the right ones with confidence now.
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Bob from SWISCO responded:
April 13, 2024

Excellent. Let us know if you need anything else, and thanks again for contacting us!
11" Series 351 Channel Balance
11" Series 351 Channel Balance
S351-11
$9.34
11" Series 390 Channel Balance
11" Series 390 Channel Balance
S390-11
$9.34
18" Series 351 Channel Balance
18" Series 351 Channel Balance
S351-18
$9.34
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