Hi Brian,
The way the
Boler 13 bunk hinges work is they raise the bunk cushion as you tilt it up. That happens because the hinges are sort of step-shaped. The step part mounts to a horizontal, wooden "shelf" that should be fiberglassed to the front wall of your
Boler, under the front window. Here is how a 1974 looks, raised. You can just see the hinges at the back:
And a photo from a cushion (not mine) that shows the hinge closer up. There are three screws that go into the wooden "shelf" and three in the bunk bottom:
The bottom end of the posts fit into these brackets:
And the top extends up over the bunk flat:
It's hard to see, but there is a little loop welded onto the side of the post, which catches a screw that projects from the bottom of the bunk piece, and that's what holds the post onto the top bunk:
Raya