Ovington I14 Rudder Foil adjustment system with tiller extension UJ's.
This is the mechanism to adjust the upper pintle location in the rudder stock.
This is the full system, just slide it inside you tiller tube and put the slots into the tiller at the pintle location and off you go.
This is suitable for anything with a hydrofoil rudder. and means you just mod the rudder stock and not the boat
Price £150
(the UJ's alone are over £100 new each)