When a stitch loop is on the needles, think of it as having two legs or sides, the right and left. The "mount" of this loop on the needles is determined by whether the right or the left leg is closest to you. The mount of the stitch on the needles is important in determining whether you need to insert the tip of your working needle into the right or left leg to create a stitch with an open base or a twisted base.
Just as a regular stitch as a mount on the needle, so does a yarn over.
I don't recall reading this article in Cast-On but when doing short rows with yarn overs, sometimes you need to switch the position of the legs before you do the knit or purl togethers. Sometimes I bother and sometimes I don't. My rationale for not bothering is that the yarn overs are usually hidden under my actual working stitch so it doesn't matter to me whether the base of my yarn over gets twisted or not. However, other knitters might find it easier to work the knit or purl togethers if the mount of the yarn over is switched.
Posts: 905 | Location: Glendale, CA | Registered: 27 June 2002
The yarnovers are not correctly positioned on the needle when you go to work them. If you don't move them, they will be twisted. For short row heels this really isn't all that big of a deal since they are worked with two other stitches and they are used to shape the heel. If someone is looking that close at your foot, they need to get a life.
The reason why the article says that you should adjust the mount of the yarnover is that if I didn't say that, then there would be emails saying that the stitches would be twisted.