M_Boats: M15 rudder assembly question

I want to take apart the rudder on my newly acquired M15 for refurbishing and would appreciate your help. Is there anything unique about the bolt that passes through the lower Pintle bracket and the rudder? On my rudder this bolt has a lock nut and threads on each end. Both lock nuts are "frozen" to their respective bolt ends. Each nut turns freely left & right independent of the other nut. In other words, the bolt seems to be broken in half. The bolt(s) don't move in or out when turned. I'm reluctant to force out without checking the group's wisdom. Anything unique about this bolt? Your help is much appreciated. Fair Winds, Mike W