Switching to a height adjustable pedestal is a great move. I’ve wanted to do it for awhile myself. There are nuts on the bottom. Having a waveshield on my boat is what has kept me from messing with this job. Without a waveshield, it should be super easy. With it, I have seen some on here report about still doing it. They have removed the side rail cover (not the name, just drawing blanks this morning mentally…lol). Then with a long ratchet or wrench, went in from the side. Do a search up above and see if you can find any of those posts. Perhaps a couple of those DIYers in here can chime in more helpfully than I right now. Doable either way. Just a bit more of a PITA potentially if you have a waveshield.