Determination waterproof handle UNTS knead with your screwdriver and remove 7 mm Allen wrench the fixing screws. Cover weighing of the stopper to knead with your screwdriver disconnect the cam case, can be removed with an adjustable wrench loosen the, replaced parts, assemble in reverse order. Can be installed even for the first time. Ultra small flat-blade screwdriver, 7 mm hex wrenches, monkey wrenches, etc. required.