Here's how to build the Wet Compass > Convert From Compass Rose to Wet Compass.
I found this in the MyCockpit photo gallery from member: Tripacer.
http://www.mycockpit.org/photopost/d...Gyro4Small.JPG
Here's the instructions:
http://www.mikesflightdeck.com/Downl...%20Chapter.pdf
This will save you a good few hundred quid!
Cheers,
Alex