I thought I'd finished the mystery tool thread, but then, in the bottom of a bag, I found these.
Each steel rod is 15cm long and on the end is brazed a steel ball. The balls vary in size and weight - 8, 13, 21 and 38 grams.
What I think they are for is reprimanding visitors to exhibitions from behind the safety of a model railway layout. When the nasal whine gets too annoying, hold one end and swing the other so it hits the cause of the problem on the top of his bonce.
The weight swung will depend on the level of annoyance. For a particularly ripe, backpack wielding problem, I recommend the 38g thwack.
Some of you may with to suggest alternative uses for these, if so, please do this in the comments. Be careful though, I am now armed!