do they need to be the exact same length, or at least within a couple inches? If and when I ever get Silver's sock class done, I'd like to try two socks on two circulars.
Excellent! That's what I figured, as long as the needle sizes were the same and there was comfortable "reach", length really didn't matter.
Does that help eliminate the laddering from DPNs, or can you get one if you're not careful beween where the knitting is divided between the two circulars?
Ever since I got comfortable with the method, I haven't had any problems with ladders. I only really did on the first "real" project I used 2 circs for (sweater sleeves) and that was a LOT of knitting, so by the end, I had it down.
Do you just tug really tight between the joins? I just finished my first hat on 2 circs (used the Boye's trick with one set of needles Amy posted about -worked great), but I had ladders between the joins. I thought I was tugging tight but maybe not tight enough, and I tend to have too much tension.