One ongoing problem I have yet to solve is how to pump air into the landing struts. The manual mentions that a tool is required with a spindle to depress the valve. I would like to make a tool but the valve has a male thread around 13.25mm ie bigger than a Schrader and I am yet to determine if the thread is metric, american or something else. Nothing I have tried has been a perfect fit so far and quite a few engineers have now scratched their heads over this.
Adventures with a Bölkow 207