Homebrew PCBs

Hi Gang,
        Years ago I built a rocking etcher. It had a AC motor with
a gear train. The table with pan rocked back and forth once per 
second. I thought that was the cat's meow until someone told me he 
was using a plastic vibrating foot bath. I switch to wire-wrap back 
then so I never got to try a vibrating etcher. If I were to build one
now I would have the frequency of the vibration sweep up and down.

                                        John