I am making the Ribbi Cardi from Chicknits. The pattern is wonderful, clearly written, no frills.
Evidently, I was unable count to 24, as I was making the second front the other day. I debated whether to rip the ribbing which was already 4 inches long. (26 sts of 2x2 ribbing; 24 sts of 3x1 ribbing across.)
After some deliberation, and examination of what I had done, I realized I could actually fix my mistake by unraveling just one stitch. Crafty Girl was assisting.
I needed to change the stitch from a knit to a purl.
A teeny crochet hook invented for the purpose of laddering stitches back up lives in my knitting basket -- I can recommend you own one of these!
Shown here is the right side. Laddering up in purl is trickier,
so I flipped the piece over and laddered up the stitch on the wrong side. All the while making sure I wasn't twisting any stitches.