Martin Baxter writes:

Capt. Neal® wrote:

Depends on the gooseneck fitting. Mine is a sliding gooseneck that
can be raised or lowered at will. Oftentimes the gooseneck will
fit an internal track in the mast and although it may have been
riveted on to begin with it is a simple matter to drill out the rivets
and change the location while adding new rivets. This would leave
holes in the mast to show that it was done, however.

I believe the gooseneck was riveted to the mast on this vessel when
originally manufactured

I believe so, too (it is definitely not on a rail or track) but will
check next time at the boat (weekend).

--Ernst