Special Tool
I can't give you specific information about the method of mounting the bow pulpit, but I can tell you about my experience replacing the stern railing on my Hunter 23.5. I, too, met the immovable object in trying to loosen the mounting screws. The "helpful hardward guy" sold me a tool that did the job. I don't know what it is called, but it is a heavy steel screwdiver-like device that holds different bits (slotted, phillips, etc.). With the bit in the screw, you hit the opposite end of the tool with a hammer. It is like an impact air-hammer, without the air. A ring on the tool allows you to set it for left or right rotation, to back out a screw or to tighten a screw. I'm sure I could not have removed the bolts without that tool. From my experience, most of the fasteners on the Hunter are threaded bolts tapped into backing plates, and do not have nuts on the inside. Hope this helps.