Corroded Shaft Strut Bolts Question

[OsideIslander]

First time posting. Been reading CF almost every day since I bought the boat(Islander 28) in July. So grateful for all the information, my boat and engine are appreciating it.

Anyways, I notice that my prop strut bolts are heavily corroded, I assume they are bronze by the green oxidation on them. The strut itself is not corroding from what I can tell when I am cleaning the bottom. Zincs look good.

See grainy image bellow:



Since taking the picture, I have tried to bust off some of the corrosion with a long poll. Access is SEVERELY limited due to the strut being directly underneath the fuel tank.

I understand that there should not be a lot of force on the strut if my shaft and engine are properly aligned but this seems like an excessive amount of corrosion. I have scoured this forum and google for insight on addressing strut bolt corrosion, but found nothing on this specifically.

The first thing I did when I got the boat was to clean up the keel bolts with a steel brush adaptor and a electric drill, and those cleaned up nicely.

I will likely do the same to the strut bolts, once I muster up the courage to fold myself underneath the cockpit behind the engine from the lazarette.

What I want to know is: has anyone had issues with these bolts? If the bolts have been corroded significantly, I would assume that they would need to be replaced during a haul out. And if I replace one at at time I should be able to avoid messing with the alignment right? Or, should I pull the strut and rebed it to stop the source of the corrosion?

Thanks in advance from a relatively new boat owner.