Original plan was to do without that bar on the actuator, but as we had no time to spare in re designing the thing we opted for what we knew worked for sure...but that is in my mind dave - to remove as much moving parts as possible...

As for the drive, its track driven...its a real pain though to set up, specially if you dont have precision methods of machining things...will give you a detailed description and photos of how it works later on...
(in about 10 days time... I'm off to the airport now :wink: )

More updates to come soonish...