Ray,
Thanks for your continued interest in the 3-way valve stem/handle problem. The NIBCO and Apollo ball valve stem extends through the handle with a threaded end and nut to hold the handle in place. The stem is a separate piece from the ball which is stainless steel. These valves are known as 3 piece ball valves (body, ball, and stem). The stem in the case of the NIBCO and Apollo valves have two flats machined on either side to accept the handle which is metal. Industrial valve design was my speciality some years back, co-inventor of several plug valves for severe chemical service. No bragging right on my part. The valves were not operated under pressure. These types of ball valves are assembled with a special lubricate that allows them to be initially operated with very little friction between the ball and Teflon seats. One the lubricant is dispersed, the ball becomes more difficult to make the quarter turn. This is what has happened in the case of the valves under consideration. In my opinion, this valve stem to valve handle design as supplied by Heartland will never stand the test of time. Hopefully others, like yourself will take a closer look at their 3-way valves and make some determination as to the viability of the valves install in their RV prior to having the problem that I had that cause me several day of misery with no hot water because the hot water heater was by-passed rather than in the 'normal' position as indicated by the valve stem. Thanks for your comments and concerns.