I can remember doing my H licence at Tidworth, mate in the driving seat of Scorpion, me in gnrs seat S/Sgt Cooper comding. Left Tidworth for Salisbury, turned left onto main road and accelerated, all of a sudden big bang,and veh slewed to right across the road. What had happened was the rhs sprocket had failed, travelled along run of track. entered windscreen of Merc travelling a bit close behind embedding itself into the backrest of the rhs seat, the lucky thing is that it was a LHD car. The driver ex squaddie couldn't see the funny side.
Barry.