Layshaft nut, left hand thread GU14217410

Layshaft nut, left hand thread. This is the left hand threaded nut on the front of the output shaft that comes loose and if you're unlucky, cuts a hole into the bell housing.  Any time the transmission is out you really ought to double check to be sure this nut has not loosened up. Used on 5 speed Big Twin Guzzi transmissions. 850GT, Eldorado, V7 Sport, 750S, 750S3, 850T, 850T3, 850T4, V1000 G5, 850 LeMans, LeMans II, CX100, SP1000, SP II, SP III, Strada, LeMans III, LeMans 1000 all years LeMans IV and LeMans V, 850T5, Mille GT, 1000S, California II, California III, California III injected,  California 1100, EV, EV Touring, Jackal, Bassa, California Special, Special Sport, California Stone, Stone Touring, Aluminum, Titanium, Stone Metal, Vintage,  Quota 1000, Quota ES1100, 1100 Sport carb, 1100 Sport injected, Daytona 1000, Centauro, Daytona RS