How to install this type of locking shoe. Tools needed?

A home owner from Charlottesville, VA says:

Hello, I have a few questions. I may or may not need window parts/tools.

In a bottom pane tilt in window the left balance spring and locking foot are missing. Home is 21 yrs old with original windows (company name not found and presumed out of business). The part pictured came with the house. Based on the next window over I think this is the missing spring but there us no cutout in the track big enough to slide the plastic hook in. Can you identify this type of track lock and do you have a video which shows how get it in to the track?

The next window over is fine. It has the pictured locking foot in the right track and a different sliding mechanism on the left track (like your part PIVOT SHOE, 9/16" THICK Product Code: 15-152).

Honestly I'm not sure I need any parts if my existing hardware will work. But I could use some guidance on the install method, tools you sell and additional options to complete the window repair.

Regards, Craig

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Tom from SWISCO responded:

Hello, Craig. The balance in your photos looks like a match for our Series 775. The guide below will show you how we replace these in the window track.

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