need new shoe and coil balance for multiple windows

A quick learner from Bethel, OH says:
May 6, 2020
I cannot find the weight on the coil, the only stamp for this window is D

I also need the cover for the track once I cut it to remove the shoe

I have multiple windows to repair, and one window needs a new tilt lock (sending other pics in a separate post) thanks! Katie
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Bob from SWISCO responded:
May 8, 2020

Take a look at our 15-175 Pivot Shoe. This shoe uses our Series 152 Coil Springs. A stamp of 'D' is equivalent to a 4 lb spring weight, which means you might need our S152-4. But look for all stamp codes to confirm. If in doubt, obtain the exact weight of your window sash, and we'll work out what you need. Many thanks. 
4 lb Series 152 Coil Balance
4 lb Series 152 Coil Balance
S152-4
$4.70
How to Replace a Triple Coil Balance System
How to Replace a Triple Coil Balance System
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