You're welcome - hope the valve works for you as well as it has for me.

BTW, Sideshow Bob is exaggerating:

1) I didn't actually buy millions of dollars worth of parts in trying to get my gear to work - only about $550 Got some cool Eurokit stuff from Italy etc, but in the end it was the Festo that was the most important part of the solution.

2) I didn't actually build a real wind tunnel to test with - simply rigged up a leaf-blower at full throttle to blow against the main gear as I retracted them forward against the airflow. Seems to work quite well.

Gordon