Originally Posted by Ripped on Scotch
I've done it but never as the quilting... the back is messy in my opinion. it is all zig zag and not always pretty.
Just to clarify:
The zigzag on the back is with a double needle (2 needles on one shaft). I think the OP was talking about a single needle with 2 eyes (which I have never seen; does this make the zigzag on the back too?).
What I was describing was simply treating 2 threads as one in a single eye (regular) needle. This makes just a regular stitch (no zigzag on back) but with a heavier layer of thread on top.