Thoughts on an Oil Filter Crusher for Interlux Waterfront Challenge

The Sea Scouts came up with these parameters for an oil filter crusher suitable for marinas:-

1) Simple devise, easy and fun to operate,

2) No hook-up to compressed air or electricity.

3) Cost under $100.00.

The initial thought was to develop a machine based on a rack and pinion arrangement.  

But we want to be able to crush the filters on the horizontal and with the above arrangement things would get heavy and cumbersome quickly.  So it's off sailing and giving the design problem more thought.