Removing aft end cap from boom

Apr 11, 2017
571
Catalina C22 Solomon's Island, MD
This is probably a silly question -- does anyone have any tips as to how to remove the black end cap from the aft end of the boom?

As far as I can tell, it appears to be a jam fit type arrangement. Is that correct? I'm sure mine is pretty well corroded, but just wanted to check before I start yanking on things too hard. The pad eye for the main sheet on mine is loose, and I wanted to get access to the inside if possible.

Thanks for any help--