Rebuilding the furler is really quite easy. I did mine about a year ago. I purchased a tune up kit (61900900) and new yoke (61980000) from my Hobie dealer. I ended up with almost a completely new furler save the center shaft. If you don't have a Hobie dealer nearby, Backyard Boats (http://www.backyardboats.com
) and Mariner Sails (http://www.mariner-sails.com
) have pretty nice online stores.
Jeremy at Surf City has a short video showing what's involved here
. Notice how he uses an old towel under his work. That trick has saved me more than a few bucks over the years in both car parts and boat parts.
The H18 parts manual here
shows an exploded view of the furler. I believe Hobie used the same furler on all of their boats.
Good luck. H14s are lot of fun.