If your floor has a good solid wood base there are items that you can install to make threaded holes fo your base. Cant think of the name for the life of me but bought them thru McMaster Carr industrial supply. ( great folks to deal with) it is a steel insert with a course wood thread around the outside that gets threaded into the wood. There is a machine thread in the center that bolts can be threaded in and out. I used them on my Islander rebuild, the od was a 5/8" dia course wood thread that threaded into my plywood floor, then I used 3/8" bolts to hold base of pedistall. Cool part was I installed these in numerous places on the floo so my seats could be positioned in various places. Mine have been in for 7 years with O issues. My neighbor weighs 325 lbs and they hold him with O issues! They go by the machine thread size, from a #10 up to a 1/2" I believe. Not expensive and easy to use as long as your floor is solid. Once installed, I had to look closely to find them in my brown carpet when I wanted to change the seat location. Damn still cant recall the name...sucks to get old!!
