if its in great condition, speed is the most important thing. air is always handled better.
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The bearing is also EXTREMELY important (unless you plan on re-machining one)...make sure sure that the platter is "floating", that is, spindle in the shaft, but unable to touch bottom (compressed foam, layers of cardboard, styrofoam in a pinch all work), THEN have the guy shrink wrap it until it won't move at all. That will insure a safe delivery should all other factors go right.