I did quite a bit of research on an aerator before I made a purchase. I wanted a dependable unit with greasable zerks and also had a motorized lifting mechanism without spending upwards of $1900.00. I wanted to have a unit that would be cost effective in the first season. What I ended up with is a Turf Vent aerator that comes with a very solid heavy duty frame and zerks for the shaft and the wheel hubs aswell. I found the unit for about $225.00 off of list from a distributor (from Arizona) and paid $499.00 delivered. Then I used an actuator arm in 12 volts and fabricated a framework out of steel with the guidence from a very dedicated friend of mine since high school. With the help of some very knowledgeable folks here on Lawnsite.com I was able to figure out the wiring and switch system. http://www.wikco.com/Turfvent.html -- Here is the original unit.