i'm just about to remove the head from the 5ME and am undoing the camshaft bolt that attachs the camshaft sprocket to the cam.
fixed: it's reversed (and the thin metal plate with the security tab has a slight gouge in it now)
btw: the cam timing mark on the sprocket is 1/2 a link away from top centre - is this acceptable for this engine? for comparison my 18R was degree'd in to suit the turbo cam, so this amount of variation seems unacceptable - but maybe not? advice most welcome.