I think you mean the hand throttle. Undo the 3 bolts that hold the control box to the console, turn over and remove the 2 lower screws which access the control cables, undo and move out of the way. Undo the large bolt in the middle of the throttle lever and move out of the way. Undo the other cross head screws and it should come apart. However the cross head screws have the consistancy of toffee and are easy to round off. A good screw driver is required and I would suggest a soaking of penitrating oil first.