Thanks for all the replies guys, taken a while to sink in but i think finally do truly get it!! Man I've been dense!
The cylindrical shiny silver bit "is" the top of the piston, i need remove the r-clip, remove the top of the piston (shiny cylindrical bit), then rotate it (i.e. like a screw, turn anti clockwise right?) and put it all back on, but my question now is, does the extra washer go to left or to the right of the shiny cylindrical bit?? Do i need some lithium grease here? What size does the washer need to be??
And one final question...promise...how do i avoid/resolve the cruise control issue?
Also, I believe I need to stick some white lithium grease sprayed on the pushrod itself and under the little rubber boot