what this could be? I know Matra made some speciality tools for vw back in the day,but i have no idea what this is. Any idea? 


its a solid rod without holeReminds me of a pressure oiling tool I've seen. Fill the chamber with oil and then tighten the bolt to force oil through the end with the ball.
looks like the bolt is a replacement for a missing piece. maybe some type of indicator tool by the ball in the end.
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Maybe its for popping ball joints loose. Any patent #s on it?
Juca, I think billwood437 might be right. Are you still flying your glider?