My 13 yr old grandson Billy and his dad have been busy designing and making leather sheaths for hunting knives that they hope to sell at a local flea market. So far the dad has been stitching these by hand, but that is taking its toll on him, plus it is way too slow. He asked me for my opinion on what kind of a sewing machine would work to sew through as many as 3 layers of leather. I told him I would ask on this forum to see if anyone has any suggestions although I did tell him he would need to use a needle specifically for sewing through leather. The dad is disabled due to losing half of his left leg almost 4 yrs ago in a motorcycle accident and the case has never been settled so he is hoping to find a way to make some extra money on the side so he doesn't have very much money to spend.