Actually that is a version 2 which has had the ball link removed and replaced with a pushrod, version 1 had a pushrod that did go inside the center of the cylinder, this one does not. the instructions should be basically the same, the only difference between versions is the actuating plunger, where in ver 2, the plunger is a solid brass bar and uses a ball link, this was to eliminate side loads exherted by the ver 1 pushrod.