Originally Posted by george_n_texas
Is there any reason you couldn't mount the tensioner like I did in this pic?
So you're talking about two bikes, right? One, you modified the tensioner and the other one you didn't? Regardless, people generally drill a small hole through it and secure it to the frame. This prevents it from the dastardly deeds you mentioned earlier. Otherwise, no matter how tight you get it, it will still move with the force of the chain on it.