What does it look like on the inside of the
boat? Is it all structurally sound, able to keep that
rudder post vertical, in position? Tiller on that boat right? Is the
cockpit floor sound where the
rudder post pops up? What happens if you grab that rudder and pull side to side etc? Wondering if there is play that allowed that damage to occur.
Looks like a
fiberglass tube possibly glassed to the
hull, with a black plastic bearing that the rudder post rides in, and the
fiberglass tube is cracked, perhaps only superficially when the bearing was inserted?
(On edit, those cracks don't make that outer tube look like fiberglass to me)