Hope you didnt do what i did with my DR and thats take the upper flippers off by removing the grubs from below. I had so many problems with these as they were done up real tight and a pain to get to. Then when off i realised the top of the flipper pops off and you undo the nut....DOH!!! 
Tried that, I undid the nut but the flipper did not want to come off,
not knowing Zaccaria's, I did not want to force it and break the flipper
