On the woodrail, there is a bracket where the hex guide is mounted. Remove the hypersleep chamber (moving part)
feel with your fingers, if there is a edge between the metal bracket and the woodrail, the chamber can hang on that tiny edge.
The metal bracket should be flush against the inner side of the wood rail. - To adjust this, loosen the screws on the metal bracket on wood rail and move it, and hold the metal edge flush to the woodrail, and then tighten the screws.