Replaced sensor assy. very easy to do. Took maybe 20 mins. Note, from previous work on washer, when replacing rotor assembly on the splined shaft have someone push drum toward the back of washer to avoid the drum shaft from being pushed out of bearings as you push the rotor assy. on. Once you have enough of the rotor assy. pushed on the spline shaft for the bolt to thread on then you can tighten the bolt and draw the rotor onto the shaft.