I installed a new chopper as mine had broken into several pieces. I also installed the adjuster kit to correct the broken wheels on the top shelf. For good measure I also installed a new third level spin washer and a spray arm seal. The last two items probably were not necessary but I figured if I am already in there I might as well take care of them for some piece of mind. Took about 45 minutes to complete everything. Straight forward job. Required Torx 15 & 20 to access the chopper.