The face of the WP30 wheelpilot is held in place by screws in the back of the unit. These screws attach to small rollers on which the unit turns. If you loosen the screws to much the roller will come off, but can be put back on.
According to the Simard web site, the Simrad wheelpilots are now own and supported by a company called Simrad Yacthing. Their web site is
www.simradyachting.com/default.aspx
Good Luck
Rodger