I have the .7x FR connected then the Celestron 50mm tail piece so I have to use the M42 to M48 adapter to connect the OAG to the tail piece. My question is how do I prevent the M42 to M48 adapter from bottoming out onto the Prism. There is literally nothing to stop the adapter from going all the way into the OAG. If you don't get it tight then the orientation of the optical train will move. What am I missing here or doing wrong?
