You shouldn't have to do anything with the pole pieces...
a lot of the time it's solder holding it on (or sometimes nothing....)
I had a tough time with the solder...the wax potting and the metal from the PU itself acts like a heatsink....I used braid to get as much off as possible then pried with a screwdriver to crack the joint....
the wax in mine was basically a solid cube...I took most of it off with a hairdryer (careful it splashes ALL OVER)