Design changed from pins to balls (becomes more ergonomic to sleep, material made out of polyurethane to be soft enough to sleep on) the balls interlock with the hexagon itself while moving down so no need of positive locking mechanism. From below the shaft will slide into bushes made out of brass/bronze. Setup will be fastened such that can be dismantled for cleaning purpose. Have tried to keep the parts to minimum as to minimize cost for prototype at least. Will CAD it completely into functional assemblies if needed.