Years ago my grandfather gave me a ratcheting devise called a brace & bit . He said it was used to drill holes in 8 x 8 timbers when they built hay barns. wooden pegs were then driven into the drilled holes to hold them together. anyway, I never used the big wood drills, but found a screw driver bit to fit it. I used ATF& acetone in a squirt oil can. I then put the big wooden knob against my stomach and pushed with all my might and started turning out the screw. The mechanical advantage of the brace & bit was much greater than any screwdriver and pushing in kept the bit in the slot. The ratcheting option let me work the hinge screw back and forth . the whole secret is not allowing the bit to chew up the slot on the screw head when backing it out. sometimes a torch to heat the surrounding metal from the backside of the lower doorpost will help, But the brace & bit was the key. These can still be found at most flea markets, usually for a few bucks and the screwdriver bit was purchased from sears (craftsman) still have it, and works better than impact drivers. Hope this helps.
