Was in sears the other day and saw a 21" replacement blade that has thick nylon spikes coming from the blade that is supposed to remove thatch from your lawn. It was about $20. Apparently you could adjust the height of your deck to accomplish certain tasks. Said something about setting the deck height to medium to pull up thatch and bad it at the same time. But you could lower your deck to scalp your lawn. I'm sure this thing probably does a pretty horrific job of actually thatching but I wonder if it would be good to use immediately before a reseeding in order to scarify the lawn surface.