Rudder Issue

Attached are photos of my now-in-need-of-repair rudder after a slip in the sling as the boat was being lifted out of the water for another issue.  I am including these photos here in hopes of finding an answer in how to repair the rudder mounted grudgen.  The lower part is fine as it is only a small post that pivots on the heel.  My question is how is this brass piece attached to the wood rudder which is covered by glass.  Before I start grinding I would like to know where, how much, etc.