S380 with smaller shoe?

A quick learner from USA says:
My balance looks like it may be an S380 but the shoe is smaller. What do you suggest?
User submitted a photo of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
I'm afraid I can't make out the exact measurement of your shoe with that tape measurer. The 15-005 that comes with the Series 380 is the smallest shoe of that type we carry, however. There are two possibilities.

The first is that your shoe simply wore down a little over time with age. This kind of thing happens all the time.

The second is that your shoe is some kind of older style that isn't made anymore. In that circumstance, you would need to file down the 15-005 a little to fit.
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