So while I'm ordering things and waiting for them to turn up, I'm deciding on cap head screws, I have some phosphate (black) from previous jobs and some stainless steel. But reading Neil's build log he used BZP from here https://www.tool-net.co.uk/s-1211/ca...etric-bzp.html (Only on page 54 out of the 81 build log - more interesting than TV however)

Any thoughts, I seem to remember that Aluminium reacts with steel, or is it stainless steel over time, like a battery, white corrosion.