Buy new one £18+vat, get 24mm ring spanner, switch is right hand side of very bottom of gear box, and is coloured green has three wires on the connector plug, use screw driver to lift the small catch on plug and pull of gently, if it does not move try the catch again.Have new switch to hand, Loosen switch with spanner, unscrew switch from gear box, as it comes loose put finger over hole to stop oil coming out, quickly put new switch in hole and tighten and re connect plug. If you are able to do this quickly very little oil will be lost if you mess it up you will have to top up gear box with more oil. do not over tighten nut
Nick, June 2008
