Ditto on the positive mast rotation system and the pvc pipe. I bought my 20 nearly three years ago. It was missing a lot of pieces and as you are probably doing, I used the manual to set it up as best I could. Then I took it to my first regatta - boy, did the old timers have a great time picking apart my rigging and schooling me on all the latest rigging techniques. H20 sailors, especially in Division 14, are a great bunch and will gladly help a new comer set up the boat. Don't know where you are, but I'm sure that if you show up anywhere at a regatta with some H20 sailors, the oldheads will be glad to help you out. If you are in the south central US, Mid-Americas on Labor Day weekend at Dallas Corinthian Yacht Club, Lake Lewisville, TX, would be a great place to meet the Divsion 14 sailors. Here's the host fleet's web site: http://www.hobiefleet23.com/
Even though my wells were carpeted, I bought the tensioning system for my daggerboards and thought they were a nice improvement.