Hi Dan , Those are v good tips , thanks for sharing them .
I have had other wood degradation issues with the use of silicon bronze fasteners in mahog .
Not only like the problems you had with those cariage bolts in the cockpit coamings , but also in the mahog wood deck boxes.
The screws that fasten the piano hinge and that overcenter clamp down latch , have turned the mohog wood soft and allows the fasteners to be withdrawn by finger pulling pressure them straight out, ouch !
I would guess that I could use “Star Board” under layment to bed the mahog wood on, instead of copper or bronze, or even a built up dam of cabosil and epoxy, would work better than 5200 or Dolfinite .