You can buy a kit for under $100 and do your own. But there are two issues. First is that if the shaft and/or housing are worn beyond acceptable limits, you'll have to get that machined and get under/oversized bearings. Might get lucky like me and use standard bearings. Second is that a re-balance is advised. You can mark everything and reassemble just like it came apart without balancing but I wold recommend sending it somewhere to be balanced.