BF wrote:
I have a tool bought back in the 70's to work on motorcycles. It's a heavy

...

Best I remember they are called impact drivers and are probably still
available.

Yup. They cost $25 at Sears. It sits in the bottom of the toolbox
until it earns its keep once a decade.

http://www.sears.com/sr/javasr/produ...id=00947641000