I build my sculptures from slabs and I love my Bailey slab roller. I'm having a problem getting a large slab without a seam running lengthwise down the middle, and I'm wondering how others do it. I cut a 25 lb block of clay into 1.5" slabs, and then lay out 4 of them in a square and roll them through the Bailey (twice) to get the final 3/8" slabs. I try to push them together before they go through the slab roller the first time, but I still end up with a weak join running lengthwise down the middle. I've tried using a mallet to pound the 4 pieces together, but it doesn't seem to make a difference. I guess if I turned the slab 90 degrees before I ran it through the second time, it would help to smush that seam together, but how do you lift the slab off the canvas and turn it after its first run-through without it tearing apart down that seam?? And for that matter, if you're not supposed to handle the slab without the support of the canvas, how in the world do people turn it 90 degrees before the second pass?