I have adapted the mirage drivewell cassette to fit the Adventure daggerboard on my Oasis tandem.
I used poly cutting board about 12mm thick. It is easily worked and soft enough to not damage the fibreglass daggerboard.
I cut up the board into 50mm strips using a jigsaw with a metal blade.
Working off a centreline I drilled and cut this shape copied from the Adventure slot:
I then cut out the top of the cassette so that the trimmed poly pieces would fit snugly like so:
Four sections are thick enough to hold the daggerboard firmly. Leave a little thickness in the lowest section large hole for the board to pivot on. I drilled it half way and shaped it with a rotary file attachment.
The sections are bolted through a thin section of aluminium on the underside of the cassette:
The bolt heads are countersunk to reduce drag.
(Note the angled shaping of the slot from underneath so the daggerboard can fold back as it's designed to)
Here's how it looks fitted:
It allows me to point much closer upwind and reduces sideslip considerably.
You should consider the sailing rudder if you don't already have it. It makes a big difference when sailing.
Check out these posts for more info:
http://www.hobiecat.com/community/viewt ... highlight=