"Muddymike" wrote in message
om...
I borrowed one of these about 20 years ago to put up 100yards of fence at
the old place. First hole fine, second a bit tough going, on the third the
drill jammed on a rock about a foot down. We could not hold the machine
and
had to let go. It continued twirling round and round with the drill jammed
firmly in the ground acting as an anchor. What to do? Thing going round so
fast we could not really see let alone reach the stop switch or throttle
control for fear of having a hand ripped off, almost full tank of petrol.
In
the end my mate thwacked the spark plug cap (it was luckily the only
easily
identifiable part as it stuck out the side) with a hammer as it spun past,
after a couple of goes he smashed the plug and cap. That stopped it.

The one I hired had a cut off lever. As soon as the body starts to rotate
the lever "hits" your body/legs and the clutch releases. No problem.