Put an isolator switch into the main battery leads close to the batteries. Or use those battery terminal twist type switches to isolate and kill the electrical circuit to prevent problems with the electronics while welding and etc.. Usually the feather sheets pop out because the bushes in the parallel arms are shot, allowing the whole knife bar to flop around. Usually undoing the skid plate to knife bar bolts and the skid plate parallel arm holding bolts under the feather sheets, then pushing the whole knife bar hard back while the various bolts are retightened will stop the feather sheets popping out. This plus a little tweaking of the adjusting bolts on the support arms under the header will fix most of the problems. Cheers!