This 3D model was originally created with Sketchup 8 and then converted to all other 3D formats. Native format is .skp 3dsmax scene is 3ds Max 2016 version, rendered with Vray 3.00 Running between 0 and 100 mm. Shown with a 50 mm stroke. Standard races with the guides points are visible on the layer "strokes" (standard races vary greatly depending on the manufacturer). M5 connector, stem nut M4, cross nut M12x1,25 (nuts are independent and positioned to use standard accessories, moving as needed). Fittings and fixtures are to be inserted into the group "body", the rod accessories are inserted in groups "A rod" and "rod B". To change the stem stroke "Rod A" output: 1) in the group "body" enter "cover" component and the end of the tube and position it to the desired course. 2) for the rod to open the "rod" component and positioning the end of the rod in the same race, then position the ends of the groups "A rod" and "rod B" at the ends of group "piston". To animate the rod move the group "Rod AB". Video tutorial in the following link.