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How to make a Lightning Cloud
If anyone else has issues with the bone channels... from all appearances the designer is sewing a 0.5cm seam ON the seam allowance that is pressed open at the back. In other words, after you have sewn the initial seams, press them open and then top stitch 0.5cm from the seam centre edge, on either side of that centre seam line. You are sewing along what would otherwise be the bit you zigzag on to reinforce a seam before trimming it off.