About 20 years ago I went on holiday to Spain. Whilst I was there I visited a nearby town with a castle (I think it was Alicante). In the castle they were dismantling some kind of exhibition: I have no idea what the exhibition was. About the only thing left (probably because it was so heavy) was this thing:-

This is my first attempt to draw anything with proper 3D CAD.
There was nothing in any language left to say what it was and no one around to ask. Now that I've tried to draw it it looks just like a medieval pin ball machine but it had never struck me that way until I tried to draw it so I guess I've got some of the relative sizes a bit wrong. It was a very sturdy bench, the "working" surface looked very much like a butcher's bench. At one end hung from springs by bits of chain was a huge piece of stone which must have weighed between 200 and 500 pounds. The stone was a bit like a tomb stone upside down but it was brought to a rough "point" or "edge" from the flat sides as well as the edges. Underneath the stone the bench was very battered and worn away into quite a deep depression.
I can't remember if the stone had some sort of handle which would have enabled someone to "bounce" it up and down.
There may well be parts of the drawing which are wrong, and, are obviously wrong to someone who knows what it is.
I haven't tried to draw the chains from the springs to the piece of stone.
I think the springs were made from flat pieces of metal like old suspension springs (not round as shown).
I can't remember if the vertical pillars supporting the springs were wooden or metal.
I can't remember how the legs were attached to the bench (someone told me it could help date the thing).
The bench may have extended a bit further behind the stone.
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