How to videos sticky thread.
http://www.automags.org/forums/showthread.php?t=252207
Youtube vid for chain adjustment.
http://www.youtube.com/user/tomkaye1.../2/87tUMyKgiCw
The retaining screw is the same screw used on the bottom for the jackshaft. Black button head screw. You should be able to find it at the hardware store for about $.25. If you cant let me know and I will send you one.
The chains are set and the unit is pressure tested at least a half a dozen times before it gets packed up for shipping. If you remove the connecting rod #53 you would be able to move the drive train with less EFFORT as you dont have to push both pistons.
We have tested with way loose and tight chains. They will stretch after running. Run it.