From these holey heels:
To two new life-saving patches:
Annnnnnnnnd my favorite pair of socks are back in action for a little while longer.
I even had some of the original yarn left in my cupboard to use for the darning! (Though, obviously, we've got some MAJOR fading going on here over the three years these socks have been in use.)
You basically use a lot of duplicate stitching with a regular sewing needle to 'fill' the hole. The heel with the totally disintegrated stitches was a bear to do, not gonna lie. (Creating new knit stitches out of thin air is NOT fun). That one is clearly not as neat as the other but I'm fairly certain it will hold so I'm happy with it. I can always get back in there and widen it a bit if needed.