Gorrell double hung window spring and pivot assembly

A home owner from Summerville, SC says:
March 17, 2021
Hi! We have been working on our Gorrell windows to replace the pivot pins as well as add back perished seal. As we go around doing so, we are now finding a few that will need this piece replaced too. This particular one still looks ok, but others are splitting.
Can you please advise from photo which parts we would need for this? Thanks very much.
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Tom from SWISCO responded:
March 18, 2021

Sure, this looks like the a match for our 15-087 pivot housing. We also sell the 15-086 secondary housing and Series 180 coil spring, if you needed them too.
A landlord from San Francisco, CA says:
March 26, 2021
I have the same pivot housing the window is 48x77 what size coil spring should I purchase
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Tom from SWISCO responded:
March 29, 2021

If you have the same pivot housing as shown by the customer above, then the recommendation I made for them should also work for you. Did you see the parts I suggested? If not, that should be the first thing you do.
Tandem Coil Housing
Tandem Coil Housing
15-086
$1.68
Coil Housing Pivot
Coil Housing Pivot
15-087
$5.97
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