Boy, Alvin, you got a good memory!!
Yes, that is the way to assure the ferrule stays tight. Use an "O" ring. Be sure you get a good quailty "O" ring that will not rot. I bought mine from an "O" ring shop here in Hurst. Yep, there is a guy here that sells "O" rings for everything from toilets to rocket
ships!
They can be found! When you slip the tool inside the ferrule, just press a little until you feel it snug up. It won't take much, but with that "O" ring, it will stay nice and snug for, let's see, I've had mine on about twenty years.
Joe
