Is there any particular reason that the fishplate(s) towards the top of the skybar framework seem to have multi-coloured bolts connecting them? I thought it may have been an artifact of the camera processing at first but it only seems to be there?
Good spot. They look like hand grip toppers, presumably to get them started by hand for speed, before the cap is removed to tighten with a tool. If so, they'd use whatever colour they come in from whatever they have lying about. Or the ebay order didn't match the description :).
I would like to think there was something more technical to it like the force on each bolt (which they Will know btw), or the order the tune needs played in etc, but think it is something as basic as seeing different coloured scaffolding node covers.
If anyone else knows or guesses otherwise please chip in.