Wondering what material these things are made from? Anyone had any success in welding up the stripped valve housing retaining threads and re-tapping them? I hate helicoils! Being time served in engineering and having full access to all the necessary workshop machines and tools it would not be difficult if the material is weldable, possibly using a T.I.G. set up?
P.S. Forgot to say even if weldable will it go very hard and thus unable to drill it?