Thor Miramar? Mine looks the same, that plastic not-quite arm rest is really on a metal piece that is screwed into the wall and comes off the metal easily with two screws, but be careful as it's a flimsy piece of plastic and has wiring going to the switches and leveler jacks stabilizer unit. Be gentle removing the plastic arm cover, it can hang by the wires, make sure the screws in the metal frame are not stripped in the wall, tighten the metal, replace the plastic and should be good. I removed mine to replace the mirror heater switch and to install a break light led for my ready break elite system.
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