On Mar 19, 8:48 pm, "MarshallE" wrote:
Are there tools for cutting old fasteners (5/16" dia bronze) from the
inside of hulls?

A reciprocating saw (e.g., Sawzall) with a long blade. The blade will
bend to cut flush with the surface. Something like 10 to 14 teeth per
inch and 8 to 12 inches long.

Good luck,

Tim