Randy, You do have an enigma! I have the earlier model (1979) with the opening in the helm seat and the insert pole.
If yours is an '80 or later it had an opening helm seat. I doubt that any one would glass shut the hinged seat lid, but stranger things have been known to happen.
That said, perhaps some Previous Owner glassed the access hole, not having the pole and not knowing what the access hole was for.
To confirm your situation, remove the aft bulkhead in the quarter berth. (Two screws at the bottom and one or two at the top, push at the bottom, pull at the top and sides.) The engine panel sits directly behind the left side of the bulkhead, with delicate wires and connections.
See if the rudder tube meets the underside of the helm seat with fiberglass threads running left and right, fore and aft, where the patch would have to be located.
If I am right, you can re-cut the hole, install a new access port and have the tube made up at a machine shop. Let me know and I'll send you up-close pics and specs.