Sure Cagey. It was before I had my Lenni, and was working with my Sitdown machine. My process that I always had success with was to make my quilt sandwich using 505 to spray baste, then use my domestic machine with the walking foot, I have a Janome 6600, to do all the straight line ditching before taking it to my Sitdown to carry on with the rest. What happened for me was that the wool batting layer was shifting within the sandwich (to me wool is a bit like a polyester batting with loft, it has movement within the batting if you know what I mean) and I ended up plowing the quilt top, so that by the time I'd stitched the width of the quilt I was getting a pucker. I never had that issue before with just one layer of 80/20 and tried various things to avoid it without success. Probably operator error on my part. The quilt I was working on had a lot of straight lines to ditch and it was so much easier on my domestic to get it done when managing the big quilt rather than trying to use a ruler and gently manipulate the quilt before any of the layers came unstuck. It was really heavy with the two layers of batting and the quilt was huge, so it's nice the walking helps a lot. I had tried separating the wool bat to half its thickness as suggested by Cindy Needham, a method she uses all the time, but my bat wouldn't separate nicely, so it was obviously of a different variety than what she uses. I probably could have accomplished it on my Sweet 16, but the thought of wielding that heavy quilt around with the extra batting and manipulating the ruler to ditch it as such was more than I was interested in doing. That was my first and only experience with two layers and wool and pretty much wrote it off unless I got a frame to quilt on. Hope that answers your question.