Whatever's in the way needs to be removed
Hi Harold -Depending on your configuration, you likely will need to remove portions of the headliner &/or cabint trim to access the nuts on the bottom of those stanchion bolts. Boatbuilders usually leave them at least somewhat accessible, but it's not always easy. Sorry this isn't the most informative answer, but the bottom line is that there has to be a way to get to those nuts in order to remove the stanchions.Best of luck,Trevor