I'm planning a series of new models, perhaps to feature in a book rather than the usual individual kits. To this end I've been looking through previously developed but as yet unused mechanisms and have come across this marble release.
The mechanism itself is suprisingly robust but as yet needs a 'Purpose'. Originally I had planned to make it drive a 'Plague of Frogs' model but found that the small weight to the marbles wasn't enough to move much of anything. I have a couple of other ideas how to use marbles to drive a model... I'll keep you posted.