I've seen hand spinners make their yarn both ways and produce beautiful hand knitted, woven, and crocheted items. As Sara wrote, the only time I know that the plying direction makes a difference is in two-ended knitting or crocheting, due to the way the yarns are manipulated during those techniques. But I've crocheted handspun yarns plied both directions and haven't had any problem as long as the twist is properly set. I would also discount that teacher's comments and teaching ability. If your customers have no problem with your yarns, just carry on carrying on the traditions and encouraging new knitters! There are no knitting or spinning police, lol.
Several years ago I spun a ball of yarn specifically to learn two-ended knitting, but the ball disappeared during a move and I'm planning to replace it this summer so I can try the technique. Happy spinning! Helen B woolspi...@aol.com [Non-text portions of this message have been removed]