problem solved. yes, it is the four pot caliper and it does swing down nicely.
The pin doesn't have a hole and a R pin, it just has a black, circular spring around a grove at the end. The whole can be tapped into position without too much problem.
Any ideas on the black, metal (anti squal?) cover? It's marked with a big arrow, is it a fair assumption that the arrow should be pointing up, not down?
bad photo here