Just a note on this - I only have about 25 min to do this... so it isn't pretty but you'll get the idea
Hopefully it is clear what is going on, but anyway.... the 485 will have a new little mounting piece and in the middle a verticle cylinder with two holes drilled, whatever angle, then an upper part that slides over with the same hole pattern, then just pop a pin out, rotate, pin back in.
If I had more time/cared more about this I would have had it have a set of "teeth" on the top and bottom bracket with a little locking device so any angle is possible