As promised, here is a couple of videos of the Wiedenmann Terra Spike XF in action. Fairway aerification went very smooth with only a couple of rough spots. #'s 6, 12, 13, and 16 were roughed up a little more than the others. The soil on this course is very tight and needs to be opened up multiple times. Each time we aerify, the soil will improve and so will the results. Notice in the videos the speed of this machine. Each of the heads hold 4 tines that penetrate the ground to a depth of 8 inches. The second video is shown with the cover up to give you a better look at the moving parts. Sorry for the shaky hand, I must have been nervous.