I found replacement window cranks at my local glass shop in central CA -
when we lived there. It was before we replaced the windows.
They are EXPENSIVE. As I recall about $25 each but it was the whole unit.
Check EBay, search window crank or window handle
Here's an example...
Item number: 170109589944
I am not sure where to shop for these items; HD won't have them. Not
particular stores (though if you happen to be in Rochester NY, that would be
great) but just what to look up in the phone book.
1) Cranks for my windows. After 25 years, a few are simply worn out.
2) Cedar siding for a shed, to match my house.