Backlight moving mirror in bathroom
Sliding contact, bathroom, expect failure.

Using a ribbon cable in the manner of a cable carrier (should not actually need a cable carrier, though if you wanted to go there you could get a small one) would be far more reliable. Fixed contacts, cable moves. Seen on many inkejet printer printheads (the "doing it with a ribbon cable method", that is.) The real things are common on CNC tools, equipment with extendable booms, etc.

The "point that's not obvious until you use this method" is that the cable ALWAYS has a 180 degree bend, even at full extension. It leaves the moving part facing away from the fixed part then bends back to the fixed part - the bend moves as the item moves.