Doe's anyone remember the ryan aerator they built in the early 70's. It was a 4 wheel,chain drive machine. It had a tripping clutch mechanism that woul'd raise and lower an axle of star/spyke blades spaced by cast iron weights. I woul'd call it the great grandfarther of todays slice seeders! Please,someone tell me they remember this machine! Perhaps i am the oldest member of this great website,Bummer!!!!!!!