I started my previous post with this. He is doing it because the exhaust shaft jumps to a stable position, it is not aligned anymore. Some valves are opened and their springs tend to push the cams back, turning the shaft. Please take a look at the picture again. You NEVER have to touch that end of the shaft or to remove the rubber caps if you don't use the special tools kit.
Edit:
Clear now ?
Edit: I don't know what happened with the picture, trying to upload again:
