Yes thanks for the link earlier but to be honest I have only just really got into the PC for gaming as I used to play xbox . A lot of the coding or HTML jargon is a bit beyond me at the moment,as are forums, but I a willing student and am trying to work stuff out. I'm loving KSP, but getting a bit stuck after hours of effort in places. I'm still to make it back from Duna, hence why I wanted to use a AGU to either take the ship home or refuel enough for Kerbal orbit, then repeat as necessary. Any advice would be great, many thanks.