Here is the deal. I have a 550 that was a very close friend of mines. He passed away from cancer a few years ago and I got the press. I ordered a quick change kit to set it up for 9mm it was set up for 45acp. The powder measure on the 45 was broke so I just mailed it today back to dillion. I started to set it up and the measurer is different that the old one as in the linkage. And my op rod only has a 90 degree bend in it instead of going back up. I can't get this thing to work at all. Do I need to buy a new op rod? I know this is very hard to explain but thought maybe some one could help