My MP10 stopped working after I cleaned the wet side, took it apart and inspected and found out that the pin is rusty at the bottom. Fixable or not? I know anything rusty is not good for the corals.
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Cannot really tell - photo is too blurry. Discoloration of the center spindle is pretty typical, and nothing to worry about IME. It does look like the ceramic sheath has started to come off. On all mine, it is all the way down the spindle with no metal showing at the base.