Cant loosen screw as its trying to strip. On control valve. Tried large screwdriver and my largest slothead bit. Afraid to do more damage...suggestions?
Pic in my album. Thanks

 

On stubborn ones I use a very large screwdriver...with a head that is barely thin enough to slip into the slot. Then sometimes I have to push down really hard on it, and use a cresent wrench on the square shaft of the screwdriver to turn it and break it loose.

I've had to use vice grips before as well...but that is a crummy location for that option.

 

Get a large screwdriver and hit it squarly on the end of the handle, this usually jars the threads loose enough to turn it by hand.

It may take a few hits.

 

If this doesn't work, get one of those hammer impact wrenches, sold in any autozone type place, it always works if you can get a whack on it...Mark

 

I'll second maybe! I work in a saltwater environment and the hammer impacts are a god send... Never had one I couldn't get out with one; as soon as they start to strip I go straight to the hammer impact.

 

The hammer impacts are great, give it a few good hits then check with a screwdriver, usually are loose