In this case I wouldn't mark this post as a copy of "MC 108" since it can't be intended for the tripwire hook to power a piston that is 2 blocks lower and 1 block off in x/z-coordinate.
1. Oops! You're right its actually not the tripwire hook, it could be any power source. I just placed the lever on the wrong side and therefore it didnt work. 2. But why is "MC 108" marked as resolved and the "Affected Versions" are all outdated?
In this case I wouldn't mark this post as a copy of "MC 108" since it can't be intended for the tripwire hook to power a piston that is 2 blocks lower and 1 block off in x/z-coordinate.