I recently did a demo on a Lazer Z 60" Eps with a striping kit and fell in love with it. I was wondering what you are seeing for an average life span out of the wheel motors? Also I was wondering why in the front caster tubes there are set screws in two holes that look like they should be grease zerks, What gives? One last question. I was wondering what kind of price I should be looking at for this machine??