Tom from SWISCO responded:
May 5, 2022
Hey, Jim. This looks like a knife lock shoe for a tilt window channel balance. It's tough to tell what you have while it's still in the track, since so much of it is obscured, but I think it looks a lot like our 15-014. Start by examining this part and see how well it compares to the original. Dimensions for 15-014
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