Mr. P is right about patience being the key to penetrating oil. Once you have flooded the area, it also helps to tap (hard!) the frozen part in several directions - left, right, in, out, up, down - to help the oil penetrate. You might also want to try to turn the bolt in the tighten direction. All you need is a tiny bit of motion in any direction, and then you are home free.
I've never owned a power impact wrench. But back in my motorcyle days, I bought a hand-powered impact wrench. It is a cylinder a little smaller than a beer can, with a 3/8" drive socket mount on one end. Once you have the socket mounted and in place, you smack the other end with a hammer. A mechanism inside converts the forward force of the hammer blow into a tighten or loosen impact. Worked wonderfully, and cost about half the cost of even a cheap power wrench.
The hand impact wrench has one unique capability. The power drivers exert force either to the left or to the right, but that's all. But with the hand driver, I could also chuck up a Phillips (or straight) screwdriver bit. The inward force of the hammer blow pushed the bit into the slot of a screw whose head was almost enitrely stripped out, allowing me to back out those screws. Seemed like those cheap Japanese motorcycle screws were always stripping out!
I own two of those hand drivers now. I seldom need to use them - but when I need one, nothing else will do.
Here's the unit that Sears carries. Go to Sears.com and enter the Item # in the Search box.
Sears Item# 00915232000 | Model# LIS29200
Bill
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