I'll take the liberty of making a small suggestion. (I wouldn't do it if it wasn't an easy fix.) The rudder pintles and gudgeons on a copper- (or Muntz metal-) sheathed ship can't be made out of iron. When iron and copper (or Muntz metal) are put in contact with each other and submerged in salt water, galvanic corrosion takes place and the copper dissolves. Pintles and gudgeons on such ships have to be cast from either copper or bronze. (I don't know whether Muntz metal can be cast into such shapes or not; I guess it probably can.)
Shipwrights made this discovery in the early days of copper sheathing. They nailed the sheathing plates in place with iron nails. After a few months the sheathing plates started to fall off, because corrosion had eaten away the material adjacent to the nails. From then on, shipwrights used copper spikes for the purpose.
So the pintles and gudgeons should be the same color as the surrounding sheathing - not black.
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