Thanks Mike. On most of my warbirds, including this CMP Hellcat, I use Century Jet 4-way variable air control valve. It allows me to "precisely" set the retract rates, both up and down, for each retract. I was using the Robart version, but since I had to tee the air lines together, which ever retract had the least friction would go up first, usually way too fast. Once it was completely up, then the other one would go up. With the CJ unit, both would go up independently of each other.