Ball is on/off. Crank is to move motor and change belt/speed adjust.
Martin

On 4/26/2016 6:59 PM, Electric Comet wrote:
this one has a speed control

cannot figure this one out just by looking at it

there is a speed control wheel but there is a lever with a black
ball on the end in this photo

http://images.craigslist.org/01313_g...6S_600x450.jpg

on/off switch maybe

https://youngstown.craigslist.org/tld/5557460809.html

the legs for the stand are interesting