A while back the subject of the terrible positions the EP of an equatorialy mounted newt can get in.
I finally remembered who had originally come up with this idea and found the instructions. They're very simple, everyone who has used them says they work really well. Like all ATM projects, almost everyone can find ways to modify an idea for a particular application.
So, here are the basic Wilcox Rings.
http://www.andysshotglass.com/wilcox_rotating_rings.html
Of all the homebuilt rings I've seen, these are the best idea.