the tripod mount has a 1/4-20 threaded connection. I threaded a 3" stainless stud into the tripod mount and had the busted blank cut back just to fit the stud, then poured epoxy into the tip and then treaded it into the rod and inverted it so the epoxy filled any voids in the tip around the stud. rock solid. (My tackle shop made it up for me!!)
I have not tried video from that position yet. It fits fairly snug though. There is a little play but I have to try it. I mainly did it for underwater near boat shots. I am preparing for the white marlin I plan to catch this summer.
