Relatively new to this hobby, but ready to learn and learning fast!!! I tried to install one of the quick type fuel valves, that eliminates having to disconnect fuel line from carb to fuel the tank, in my Hobbico Superstar Select 40 trainer. I drilled the hole to mount the valve under the engine, and to my dismay disovered that the threaded spool of the valve isn't long enough to extend all the way thru so I can put the lock nut on it from the outside surface of the plane? Before I fill the hole I drilled with some wood putty I thought I'd see if any of my fellow fliers had any suggestions!!!