Just a little question I have to ask which may sound a little trivial. On carbie seat needle valves you usually got the little spring loaded pin on the bottom of it which contacts the tab on the float. What is this little spring thingie for does anyone know? The needle valve is closed when the top of the valve contacts the seat and closes yeah? but then theres another, mil or two of movement that the float has. Anyone know? Does the float actually move up after this point? or does it depend on a number or things, such as float buoyancy? yada yada?