Dude...first look at that thread, RaviChopras cocker guide tells all...then get an E-Blade for it and you wont have to bother..
But put simply...each trigger pull on a mech cocker does three things....the first bit of the pull fires the marker...the second bit recocks the marker..and the third bit closes the bolt ready for the next shot...timing it is done with the rod that goes from the trigger blade to the three way valve, and adjusting its length and position..(i think)...on a hinge frame cocker, the three way works in reverse...