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Most of the refrigerator compressors (piston types) I have tried will not produce a vacuum better than 1 mm of mercury. The best I could get was by drilling a hole in the side of the cylinder, just above the piston at it's lowest point, using that hole as the vacuum line, and using a second pump as a second stage. I could never use a mechanical pump to get a vacuum good enough to produce X-rays. Leaks, oil vapors, and out-gassing were always a problem.
By messing around with a light bulb & grandma's magnifier, you can get stuff like this:
DIY LENS TESTING WITH a STA...View Instructable »
Perhaps you can add different colors to make eyeballs. :)
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