I do have a possible solution to this dilemna, and I will try to write it up at some point.
But I am more interested with what the other gentle reader/writers come up with. The fun thing with the challenges that Wendy and I played with in the past is that we pretty much never came up with the same ideas for the solutions to the set up.
When I free up some time over the next few weeks, I'll put together my own solution but before then, (and even after), I welcome any other attempts.
Tank (who does have it in the back of his mind to come up with more of these in the coming new year)