Soldered 03012-001 servo control board but with 20k and 24k resistors for R1 and R2 to reduce the range of motion to just 45 degrees. Printed and assembled corrected pinch valve geometry mark 1. Unfortunately there is not enough torque to compress even this soft tubing, so we will try something different. I don't want to pivot (no pun intended) to a beefier servo than the lowest-level hobby grade. See video of the fail.