Here's a pic of the cardboard template blutacked on to test for size, placement and spacer depth required. Guess who's printer only has black and magenta ink left!!! It looks like I've photoshopped it for some reason.
What do we think? Should I head to the local engineering firm to knock up a couple? Back calipers are going to be much trickier though - the spring is much more recessed (about 1.5cm)