Still have parts left, harry do you still want those pieces?
I'm also considering selling my pilot chamber valve experiment which is basically a 4wd version of POP! a pneumatic antweight. The pneumatic system doesn't work but could do with some tweaking. the system is fully cnc machined from aluminium and sits in a 3d printed nylon chassis. It uses a 8mm parker solenoid valve to actuate the pilot chamber, the issue is the shuttle inside the chamber and getting it to move effectively. the robot comes as is with all the electronics and the shuttle issues. This cost serious money to experiment with and I'm only going to sell it for the right price as I don't have the time to get it working properly but I'd like to see it go to somebody who could do something with it. contact me for a full breakdown of parts included. I'm only going to sell this to somebody I am confident can do something with this. It's made to run at 100psi and weighs 150g.