Pet clutch skids on the key shaft to rotate with it. All of the equipment around the layshaft is mounted with it.  When the still left-hand Doggy clutch is introduced to skid on the left with the gearshift lever, it messes with the clutch gear, as well as upper-speed gear https://gearbox-auto99865.ageeksblog.com/32703724/gearbox-auto-can-be-fun-for-anyone