Don't have diagram but the spring goes in first,if it's a tappered spring put the biggest end facing to the bottom of the cylinder and then put in the piston it will have a rubber seal attatched to it put that next rubber end goes in first.
next will be the pin,if it has rubber attatched to it the rubber faces out and then the locking washer you will have to tap it in with a screw driver and hammer you might need to tap the edge of the housing over to help secure it.
Good luck
Mark
October 2011