Pivot lock shoe

A handy person from Greenwich, CT says:
September 1, 2020
This PLS accommodates a coil spring that extends along the side of the track and keys into a top flange of the PLS. The PLS itself fits in a track that is 1.25" wide. From top to bottom it is 1.25" tall and .5" deep.
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Bob from SWISCO responded:
September 4, 2020

I am afraid I can't identify this pivot shoe from these pictures alone. Can you remove it from the window so we can get a clearer picture? Can you also double-check the length and width once you do this? From there, we'll do our best to help. Many thanks. 
A handy person from Greenwich, CT says:
September 4, 2020
Actually a good exercise since now I know how to replace the part and was also able to Jerry-rig one of the broken pieces to key into the flat spring so I now have some buoyancy with the top pane. Here are the pictures of the stand-alone shoe validating the measurements I specified.
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Bob from SWISCO responded:
September 4, 2020

Thank you for that. I believe this is an older version of the 15-140, which uses our Series 150 Coil Balances. Take a look and see if you concur. 
Coil Balance Shoe
Coil Balance Shoe
15-140
$3.07
Coil Bushing
Coil Bushing
15-143
$0.97
Coil Bushing Cap
Coil Bushing Cap
15-144
$0.70
Coil Support Barrel
Coil Support Barrel
15-145
$0.49
3 lb Series 150 Coil Balance
3 lb Series 150 Coil Balance
S150-3
$6.30
8 lb Series 150 Coil Balance
8 lb Series 150 Coil Balance
S150-8
$6.72
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