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Ha, yes I think it is the same principle. It seems to be analagous to the 'extreme' one on my page - ie. everything sitting above the polar axis. And the axis of rotation appears to be the short axle at the bottom? I'm assuming it isn't hanging/pivoting from the tall arm - ie. the tall arm is a lever for rotation? And the pivot is at the bottom where the tall arm joins the short axle?
The guys on the Yahoo Eqplatforms group pointed out some of the centre of gravity issues. If you can arrange it so that the COG is below the polar axis, then it should be self-righting (ie it won't dump the scope). Someone suggested physically restraining it - which looks exactly like what you've done with the lever.
Using the ball joints allows the scope to sit in the middle of the polar axis and even cross it.
With yours, I think you could raise the back of the platform so that it sat level to the ground. I don't think that affects the tracking motion of anything sitting on it. I suspect you could even then extend the platform out in front of your front pivot?
Cheers.
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