Craftsman DYT 4000 Deck Rebuild Kit. The craftsman DYT 4000 deck rebuild kit includes the spindles, the pulleys, and the mower blades. The rebuild kit allows you to easily replace the major parts involved in rebuilding a mower deck. It is cheaper to buy a deck rebuild kit than to buy the individual parts separately. They deck rebuild kit does not come with new belts although they are highly recommended. Worn out spindles and pulleys are a common issue with older decks. The craftsman DYT 4000 deck rebuild kit is a good investment to prolong the life of your mower.