How can I keep my router bushing assembly in place?

When I put a guide bushing in my router, and tighten it to the mounting ring with pliers, the ring usually works loose before the job ends. Is there some way to keep it in place?
—Jim Bishop, Lincoln, Neb.

Try a drop of thread-locking fluid, Jim. It comes in different styles for different purposes, and for this job you want the medium strength version. Look at a hardware store or home center for Loctite Threadlocker Blue, or a similar product. It will hold the bushing assembly in place despite the vibration caused by routing. To avoid difficulty separating the bushing and the mounting ring, take them apart at the end of your workshop session, and clean the residual material out of the threads with an awl or a brass brush.