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A booby-trapped motorcycle loaded with nails and ball-bearings went off in a crowded bazaar Friday in Baghdad, killing at least 13 people and injuring dozens, Iraqi officials said.
But if people are firing ball-bearings at cars on the M62 the potential for such stupidity to cause an incredibly serious collision on such a busy road is obvious.
A recirculating "train" of steel ball-bearings run in grooves of the helically-cut, matched groove nut and screw.