I realize what you say is true, but for what we are doing and for the length of time it will be in service, it will work. It is mostly for software development so the logic and algorithms can be proven and demonstrated on a little test engine. Big engines already have big expensive valves. After it homes, softly, on each startup it will know where it is and not go to the ends of travel during operation. Pushing the plastic nut in and out of the natural gas fuel stream will load nothing. It is more of an obstruction than a. Does the stainless lead material drill nicely?