integrally formed with flat metal piece or portion 92 which abuts plunger 74 u2032 of solenoid 32 u2032 when plunger 74 u2032 is in its extended position and the shift mechanism is moved toward its reverse position the abutment of portion 92 with extended plunger 74 u2032 prevents hydrostatic transmission 88 from being shifted from neutral into reverse in fig9 plunger 74 u2032 of solenoid 32 u2032 is in its retracted position and portion 92 is able to move past retracted plunger 74 u2032 and into any one of its variable reverse positions 0040 fig1 shows the schematic wiring diagram for activating solenoid 32 32 u2032 as shown the electrical system of mower 20 includes ground 94 battery 96 starter 98 ignition switch 100 ignition unit 108 alternator 126 headlights 128 and fuse 110 the electrical system also includes solenoid 104 which may be used for other operations associated with mower 20 clutch brake switch 102 and seat switch 106 clutch brake switch 102 is shown in the position which represents the pedal being up and seat switch 106 is shown in the position representing that the seat not being occupied by the operator of mower 20 switch 112 is connected to clutch brake switch 102 by terminals 114 122 and 120 switch 112 is connected to ignition switch 100 at terminal 118.