Sounds about normal.
I removed my cabin top hand rails. I had to pull the bungs in my teak hand rails. That gave access to the screw heads. It was a two crew project with one on the cabin top holding a screw driver and me inside removing the nuts. When released I could repair the holes that allowed water to leak into the boat and clean up then varnish the teak rails. Installation was just reversing the process. Varnish the underside of the hand rails before installation. Save the top side till you have installed the hand rail, reinserted the bungs to cover the screw tops, and cut off the excess bung plus sanded the bung top smooth. Then you’re ready to varnish the top side of the rail.