Close up of mounting base. 1/4" steel base cut with plasma cutter. The jaws are cut out from a piece of steel pipe. Room is left for the door to open. The pipe is cut at the back and a cut down hinge welded. The left jaw is welded to the base, the right jaw is free.
The jaws are lined with foam so they are gentle. The thumb screw tightens the base to the exhaust. There is a steel strip reinforced with gusset. On the left side there is a captive nut, and the tightening screw tightens with this until the exhaust is secure. Then the right nut is tightened against the steel bracket, so the set screw can not back out.
The left jaw is also reinforced with a gusset so the left jaw does not lean as the set screrw is tightened.
The plate is mounted to the table with bolts.
This mounting is very robust and secure.