That does look oddball, not seen a bottom pin type like that for ages - back in my CB radio days!
What might be worth a try is unsoldering it from the daughterboard, carefully prising open the metal lugs on the back and opening it up. Clean the carbon track with some contact cleaner, clean the wiper and check there's enough pressure on it, and bend the tangs down gently for a bit more if it hasn't.
Used to do this trick when i was a kid.
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Back from 30 year retirement finding use for my thumbs again, slowly getting faster!
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