Coil Sprung Pivot Shoe

A contractor from Carpentry says:

I can't seem to find the right size. Looking to replace the shoe and the coil on both sides of the windows

1 1/4 wide

9/16 thick

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Tom from SWISCO responded:

Hello! This shoe appears to be a dead ringer for our 15-111. It's 1/2" thick, not 9/16", but I would triple check that measurement just to be safe. I've never heard of this made in 9/16".

Alternate image for 15-111
Alternate image for 15-111

A contractor from Carpentry says:
Gotcha, so they do not offer 9/16 thick model?
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Tom from SWISCO responded:

Not to my knowledge, no. I've seen one uncommon version of the 15-111 that was around 3/4" thick, but that's the only variant I can think of. It was an obsolete part anyway, used for a very old window. 

I'm sorry that we can't offer a closer match to your specifications.

A contractor from Carpentry says:
No worries I think the 1/2 model with work just fine very close to 9/16 so I will order that. How do I determine what coil to order. I saw there are different lbs option does that just vary in size of window?
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Tom from SWISCO responded:

The 15-111 is typically used with the 1/2" thick Series 160, however it's also technically compatible with the 3/8" Series 165, too. You should measure yours to verify. It's probably the Series 160 but it can't hurt to be sure.

There should be a stamp on your old spring that tells you what the best Series 160 option will be.

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