Backwards Loop Cast On
The backwards loop cast on is not recommended as a general cast on, but it works perfectly if you need to cast on stitches in the middle of a row, for example at the underarm of a top-down sweater, or at the ‘crotch’ of a mitten thumb.
Backwards Loop Cast On :::
Step 1: place the working yarn over your thumb
Step 2: the right hand needle goes under the yarn at the base of your thumb (as indicated below) and over the yarn at the top of your thumb.
Step 3: tighten your newly cast on stitch