I have tried and tried. When I sew two layers of dense poly webbing together, instead of making a long straight line, it curves, or if I force it to stay on the straight line, then the opposite has ripples. I don't know what to do. The idea is a layer of fabric is to be sandwiched in between like an edging. Do I need to revamp the design and go with a different webbing or is there a tip to get it to sew where it stays straight? I have the edges matched, tried different thread, use 69 poly upholstery non rot thread, and still a long piece say 30" or longer will come out curved.
I did notice no one mentioned owfinc.com for parts, patterns and long list of stuff.