Steve Sowatsky said: Have you checked the timing on the aerator? If the timing is incorrect, there will be wear on the side walls of the tine and tine will fail prematurely. We usually get 2-2 1/2 full 18 hole aerations out of our dillennium tines.
I have a 48" soil reliever which does not have timing set up on it as far as I can tell. It has what I would say is a solid crankshaft setup that moves the arms and even slack in the chaines will not change how the arms go up and down on it. My old GA-30 however had timing on it. it is basically a solid unit but I know something is not perfect on it due to some tufts I get on the second arm from the left. It had been a demo unit before I got it and has done the same thing every time we have used it.
Maybe I got a bad set of tines the last time I bought them. I know when we first got the machine it would get 36 holes on the tines from JRM. I am getting ready to try a new set from them so we'll see what happens.