Tony - your knowledge and access to paraphanalea ( spelt right? ) just blows me away mate.
We had a Hercules at Engadine Leisure Centre for a short preriod of time - it was big and useless and as others have said SLOOOOOOOW - just a novelty. My ( bad/fading ) memory tells me the balls were green ( like that other stuff that made my memory bad
) and they were hockey balls??