Robert or Karen Swarts wrote:

Assuming one makes provision to access and mechanical or electrical
components within the mast, are there any compelling reasons NOT to foam
fill the mast?


About the only foam you would ever consider placing inside a mast would
be blocks of soft furniture foam for the purpose of quieting any wires
inside the mast that might be slapping the mast.

IMHO, the result is almost the biggest PITA on the planet.

Been there, done that.

A good messenger cable makes the problem go away.

Lew