answer:(How does the dealer do it?) Just googling around I see references to 14mm bolt on the armrests of Kia Sedona captain’s chairs. (Do you have captain’s chairs?) That bolt is probably under a plastic fascia that can be gently bent away or removed somehow, maybe held on with small screws. Get yourself a 14mm open-end wrench or ‘crescent’ wrench, and a big screwdriver (for the gentle bending), but first inspect the whole thing to verify that’s what you’re up against.