Not hard to do at all. Contact Stu with the Catalina 34, he has pics and detailed information on how to do it. Quite a few people on here are really helpful with tips on how to prevent water coming in while doing this, etc. $424 better include a haul out. Damn that's steep. It won't take a first timer an hour to do it. Basically it's just three rings of flax, looks like thick string. You unscrew the locking nut, back off the big nut until you can pick all the old flax out, insert new cut pieces one at a time, screw it back on and your good. Some guys make tools out of little pieces of PVC to set the flax in place. But you'll get a gazillion responses and tell your boatyard no. The flax costs about $10 a roll, of which you use about a dollars worth.