It's quite simple.
You need to rig up two cogs, rotate the cog mechanism, which in turn pulls back a trigger that, when released, hits a lamp post with a boot hanging from it, the lamp post swings round and the boot kicks a bucket containing a large metal ball. This ball winds it's way down an uneven staircase and lands in some guttering. It travels down the guttering and hits the bottom of some scaffolding, at the top of the scaffold is another precariously balanced metal ball, it rolls down a kind of diving board thing and lands on a see-saw. On the other half of the see-saw stands a swimmer in the diving position, he is propelled into the air and back flips into a big tub, this unbalances a big pole and the cage will awkwardly desend and trap the mouse.
You need to rig up two cogs, rotate the cog mechanism, which in turn pulls back a trigger that, when released, hits a lamp post with a boot hanging from it, the lamp post swings round and the boot kicks a bucket containing a large metal ball. This ball winds it's way down an uneven staircase and lands in some guttering. It travels down the guttering and hits the bottom of some scaffolding, at the top of the scaffold is another precariously balanced metal ball, it rolls down a kind of diving board thing and lands on a see-saw. On the other half of the see-saw stands a swimmer in the diving position, he is propelled into the air and back flips into a big tub, this unbalances a big pole and the cage will awkwardly desend and trap the mouse.

