Channel balance bottom shoe and winged questions

Question

I have one Milgard (circa 1983) window that needs new channel balances. The bottom shoe is broken and missing, both sides, therefore I don't know the size. It appears to be non winged style. Can winged be used in place of non winged? For example a S385-21 in place of a S390-21?

Also, how would I determine the correct bottom shoe size, 1" vs 1 1/8" vs 1 3/32", being that mine is gone?

From the stamping, I need an option 2040. Please help.

Bob · Accepted Answer

Thanks for posting. Since it appears both attachments lack wings, we can eliminate the Series 380, Series 385, or Series 350. This leaves us with the Series 390 or Series 351. The Series 351 has a nylon shoe with a depth of 1"; the Series 390 has a nylon shoe depth of 1-1/8". Is there by any chance another window in the house of the same size? If so, could you extract one of the balances to see if you can identify the style and depth of the shoe? Otherwise, another option is to simply go with the S390-21. If it turns out that the shoe is too deep, you could sand down the butt of the shoe a little, from 1-1/8" to 1". But keep in mind a modified product is non-refundable, which is why I'd prefer if you could check another window, if possible. Many thanks.