I dip each gauge in Way Lube after cleaning, visual inspection and checking diameters and PD's, after each use.
Sending out the Go Member for repair and calibration would cost less than a new Go Member?
Usually if a small gauge is galled it gets replaced with a new one. An inspector told me too much plating in the tapped hole as the reason why it was galled. Maybe he gets a Tin coated one next time.
I admit I took the member home last night for an experiment. I placed the member in Gallium for about an hour. It appears the aluminum was just starting to be removed. I checked the Pitch Diameters this morning and appear to have no change. Not so sure about the integrity of the steel.
I thought the Gallium would work faster. I'll try some more tonight.