I also had the same problem with overtightened screw. I feared I was going to strip the screw head, and as I am fortunate to live in San Diego area I took it in. Jerry eventually was able to loosen it. Forget using an electric screwdriver, you need a lot of torque. I noticed the small screw driver that came with Robo has a really good tip but is too small to get the proper torque. The other longer screw drivers I had didn't have as good a tip. I think if I would have gone to Sears and got a got an equally good but longer one, I think I could have gotten it off myself.