Hi, Given the advice in the past of renting a toro dingo soil renovator to renovate a lawn, I have used it for 2 lawns now and run across the same problem. In short, the machine sucks. It does not have enough power to dig more than a few inches, and it leaves the existing grass in clumps all over the lawn (which has been sprayed 2x with roundup and is dead). It does not bury rocks as advertised but instead drags them up to the surface. 2 falls ago I did a renovation on a small (5k sqft) lawn and he complained it was bumpy. So I had to come in with topsoil and level out the low areas. Last fall I used the same machine on a 15k ft lawn and have the same issue. The customer has not said anything yet. But what I am looking for help on is: 1) How should I fix this problem with the bumpy/uneven lawn 2) What should I use in the future because obviously this machine sucks for this job. I know that skid steerers have a renovator attachment, but these do not go very deep only a couple inches. I know you are supposed to mix in amendments into the top 6" of the soil so this will not cut it.