First!
Righty Tighty - Lefty Loosey
Use good driver bits or drivers. Don't skimp or try to save money here you'll pay for it in te end.
If you have been smart and stopped trying to turn the screw out before the head is cone shaped try the following:
Apply enetrating oil, wait a half hour. Remove screw.
Tap your screwdriver lightly with a hammer as you apply turning force to it.
If that doesn't work, place a screwdriver bit into the philips "star" and heat it cherry red. Leave it there until it and the screw have cooled. This will expand the scew, hopefully breaking any corrosion bond as it cools. Remove the screw if possible. Use the previous procedure if needed.
Note: - your may want to heat the bit out of the scew and then place it in the screw with a pair of pliers if you are imprecise with your torch work.
If the screw head is stripped or nearly stripped try the following:
Place the end of a flat punch (pin punch) about at least the size of the screw head over the screw and whack it. This will close the philips "star" again giving your driver some bite again. You may have to whack the screwdriver into the new star. You might try heating the bit here as you are almost to the end of the options.
Apply some "valve grinding compound" to the screwdriver tip. This will give is extra "bite" and help prevent it from camming out of the screw head. Remove the screw.
If you have gone and just made a funnel shape of the screw head, get a center punch and drive it into four points arond the screw head making another (boogered up) "star". Heat a bit as described above. I don't hold out much hope with this method, but it will sometimes work.
There are some screw extraction devices that are sold by crafstman and others that look lise reverse running countersink bits. Try these, too. They will work on screws that just need a little extra force to come out, but they will only chew the head off if the screw is actually frozen.
If all else fails: Drill.
I'll not go into this as it requires equipment and o
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