If it will help and you recognise what I describe, I can start you in the right direction. There is a spring loaded tab that is part of the cylinder assembly protruding through the aluminum column housing. I see it in your pic but am not able to point to it. It needs to have a thin screw driver (flat) inserted aginst it to let the mechanism release to slide the cylinder out, just as though it had the screw retaining it. Find it, push it in (sometimes a bit stiff to push in) and wiggle the cylinder outward.