The square shaft is clean and straight. The shaft rotates nicely without the RC valves in place. In fact, I have assembled this combination of shafts, RC valves and cylinders in every combination possible. Left valve only, right valve only. First in cly. A, then cyl. B. The problem follows the cylinder. I have a friend who is a porting genious with the proper tools. He has the expertice to create a little clearence within the RC valve cavity. I am going to give that a try. I will report back on the outcome.
Also, I was planning on using a synthetic oil on the RC shaft for final assembly (Amzoil) because of the heat. Does this make sense to you?
Mark