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Bought a 520xi with a 52" Side Discharge Deck #78370. Got the belt gremlins figured out I think. I replaced all of the spindle bearings as the left one was shot and sounded like a B-52 in flight. It's a very strong mower, but the scalp mark going down the middle of each pass, isn't good. The center blade is cutting significantly lower than the outside blades. I measured the right and center on concrete and the middle blade, when pointed straight forward, is about 5/8" lower than the right side blade, when it is pointed forward. When I turn the blade tips to meet (side to side bias), they are pretty close to being the same height, maybe off a 1/16" to 1/8". I removed the anti-scalp rollers in the front when measuring as well. I didn't mow enough with it before I changed out the bearings to really get a feel for the cut, but I would think it would have jumped out at me.... Any suggestions? I am at a loss.