Well, this turned out to be my way in... although the screw that was in there just wasn't long enough.My first thought was to go in through the blinker hole with a stubby screwdriver and torque it down. I don't know if my hands will fit though.
Instead of using a longer screw and struggling to torque it down with my fat hands, I just used a wall hook that was long and thick enough. Worked well. Going to have to do the other side too.