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Hi James,
the collimator is for Newtonian scopes. It's based on the principle that the laser beam completely folds back on itself and hits the exact spot where it came from.
I don't think it would be terribly useful for collimating a refractor, but at least you could check that the beam exists the objective lens square in the centre. I guess for refractors a laser with holographic attachment (like the Glatter ones) would be more practical.
Regarding the ED80, I bought it without tripod and mount, to save on shipping. Just contact Dave, he'll be glad to get rid of it.
Cheers
Steffen.
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