Yes those are tube worms. They are a soft growth. Not too hard to remove. Unlike the barnacles and oysters we also get. DAMSELv was in the water a little too long between antifouling coats.
We don't know how our rudder was damaged, but we know she broke loose and grounded during a huricane according to the PO.
With the coupling we could remove the rudder in the water if we absolutely had to.
Crevice corrosion is normally checked with die that makes the cracks stand out. (Aervoe about $30 a kit, magnaflux is another brand)
I have been paying $50 to $80 per chain plate for replacement. From a local machine shop in 316 stainless.
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Carl Damm
DAMSELv
1976 #593
Stuart Fl
