Recently bought a second hand Fleetwood van, and found out the corner steady hexagon headed screws we use for lowering and highering are worn to the extent that my new standard extension socket is spinning on the hexagon, the steadyies are well greased and are not tight. Question:- is it possible to replace just the screw, or do I have to replace the corner steadies complete.In either case can anyone point me in the right direction to purchase these items . Thanks for any help offered.