On my 1979 H37C .....
They are attached to the coach house with stainless steel screws from the top. They do not align with the interior hand rails.Simply drill out the teak plugs covering the screw heads and remove the screws. If you have the time and patience, you can drill out the exiting holes larger and fill them with an epoxy type filler and then remount the rails, resolving any possible future leakage. Otherwise you can just re-bed with 4200.