Jean-a-ma-jig is my go to tool for thick seams also. I use it when I am shortening my dh's jeans. That inside and outside seam really mess up the stitching otherwise. You have to go slow but then you would have to do that anyway. It works great on the thick seams. I usually sew the hems on my Singer 99 but these are new jeans so not as tough as that old denim.
Last edited by KLO; 01-13-2014 at 04:17 PM.