Ahhh the venerable Moggie, there are still a few around my parts going as strong as ever. A fine example of simple and effective design.
My first one was an Austin A55 "Cambridge" with extra string, no less, with that stump puller 1st Gear, the injudicious use of which could start a driver induced rapidly divergent feedback loop of kangaroo hops.
Yes indeeed a very efficient way of dismantling an exhaust system.
Whilst converting a young tyro to a C421C I was once not quick enough to stop the chappie from turning the mags back on after he somehow turned all four of them off with that gang bar thingy whilst he was supposed to be checking them one by one.
Deafening silence followed by frantic lunge and "NO leave them off now", too late, dual Kabooms, satisfyingly large sheet of flame followed by clanking noises as various parts of the exhaust system are distributed randomly beneath the aircraft.