make sure to use your sears screw driver so you can use the lifetime warranty. I would try the chissel, the screw driver that you hit the end of it but try to make a slot on the head with a dremel and once you get them out use allen ones and use blue lock tite on every bolt on the damm shee. You will not have to tighten it that tighten it that tight and it will hold. I learned this the hard way. My bolts kept falling out. BLUE LOCK TIGHT!!!!!!!!!!!!!!!!!!!!