Along the same line as the battery compartment, I bought an MX that was dead. I removed the bottom plate- 3 screws (over towel so they don't bounce away)- and found the battery end of the camera had corrosion not visible from the battery compartment. Possibly sweat from a hand over the years?
I'm not sure what was wrong and what fixed it. Maybe the ground connection was weak? Anyway, I wiped things down, a little alcohol, a little pencil eraser to rub some random metal pieces. Put the plate back on, reinstalled batteries, and I now have an MX with working meter for $20.
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