Hello, Would there be any interest in a rebuild-able heater control valve? I have a 70 Polara that I would like to take on a road trip to the beach one day and my old man was always hesitant on taking that car to far from home due to the heater control valve and its proneness to cracking. He was concerned that you could carry a spare but that one may not even be good. I have access to 3D modeling software and a machine shop. My background is in mechanical engineering, specifically designing valves. I was thinking of seeing if I can get one design and tested to hopefully use easily sourced seals. Thoughts?