I used mine to straighten the shaft on a hydraulic cylinder before
rechroming. Went from about 1/8 inch bend to a couple of thou, which
was close enough.

It's also great for destroying bearing cups when putting in universals.
At least until I figured out the spiders were .050 too long for the
yoke :-)

I don't use mine every day, but it's darn handy when you need it.

Paul