Now that i read your description i know i have seen people do it , only it didn`t have this name ,,,, not that i can recall them calling it anything but a changeable heel , and the woman who was doing it indeed prepared 2 spare ones ,,, which she later would graft in place of the one that got ruined .... mirjam
>Well, I don't think so. When making an afterthought heel one knits
>50% or 60% of the sock stitches onto a waste yarn, then knits across
>the waste stitches and proceeds with the sock. Once the toe is
>finished one pulls out the waste yarn, picks up the live stitches
>(plus extras to cover over the holes at the ends), then knits the heel
>that's really a toe.
>
>So sure, knit a "spare" but you'll have to graft it onto 100% of the
>live stitches! Easier to just pull the old damaged heel off, pick up
>the live stitches again and knit another - who cares if it matches, >right?