Changing pads in AP calipers

[habitualvoyeur]

How the hell do you get the retaining rods out that hold the pads in place
I made a perfect sized drift from a stainless steel pin - no chance !!
I tried the usual WD40 on 2 seperate occasions
I had the fronts ones out and put a bit of copper grease on the ends so no problems there now.
BUT the backs are solid all 4 - I cant believe these retaining rods are made of a corodable metal

Any advise