Hello to everyone! I am looking for input on the Cobra class 26 machine. Right now I have a Consew 227r, but find that it quite often gets "hung" up right before going over a thicker seams. I even find that the stitch length changes somewhat as if it can't pull heavier fabric through at the same rate as it would, say, a couple layers of canvas. I find myself tugging from behind to help it along. I know how to adjust feed, timing,etc. I'm working with more leathers ( 3-4 oz.) now for bags an