I used to repair horse blankets at the leather shop I worked in. That is the dirtiest and nastiest job I ever had. Even if they are freshly laundered, they still reek, and you end up reeking as well. You gotta really love the smell of a horses rear-end to do this. If your DH and DS really want to do this, let them get their own industrial machine and set it up in the garage, but NOT in your sewing room. I am serious as a heart attack on that point! :-)