I just completed my first ever sock, and it turned out great, except the top edge was too tight. Thinking I could easily fix that problem, I ripped out the roll-over top edge and I accidentally ripped out two rows of ribbing, too. I tried re-doing the two rows of ribbing, only to find that it doesn't look right. The new rows don't match the old rows. (Because I'm knitting the opposite way, I can't distinguish the knit and purl stitches). Is there a way of re-doing the top of a sock, or should I just bind it off? Or should I knit a new top on separate needles and then attach it to the sock?