The single rocker switch on the side are the older models
The horrible push from the top type covered 2001ish to about 2007/8, when the rocker returned but on the top behind the handle.
If you ever tip it over in use, it will roll onto the switch and turn off!
The push button switch was used from 2002 until 2006.
The rocker switch was used before that since 1981!
I have a motor lying around somewhere, I'll try and find it.