About a year and a half ago, I bought a nice 4.5 inch Craftsman electric die grinder. I thought I might use it to cut the engine out of my BMW. So, last night I'm putting a lot of things back on the car: control arms, intake, swaybar links, struts with the new Koni's.
Well, the new swaybar I bought had mounting points that were too thick for the stock end links. So after talking with the builder, I ground away 1/8-1/4" to make the endlinks attach better. Time total for both sides: 15 mins.
Then I was building the struts. After putting on the rears, and installing the control arms (what a pain in the arse that was), I started to build the fronts. I noticed all that excess stock perch that the coil-over sleeve sits on. I pulled out the air cutter, and after about 2 fill-ups of the air tank, I decided that the die grinder with a cutting disc was the way to go. I took about a pound of metal off each strut. Time - 20 mins. I can guarantee it would have taken about 1.5 hours with the air cutter.
Moral to the story: an electric die grinder is a nice tool to have around, and makes the perfect Holiday gift.

- AB