Mikey, Call Dillons and arrange to have your 550 sent in. They will completely rebuild, upgrade, and readjust it at no charge.
I bought my 550 at Dillon's "walk-in" store in Scottsdale many years ago when I was living in the Phoenix, AZ area. Later I broke the feeding platform through misuse. I went back to the store expecting a hassle but instead they handed me a new platform, no questions asked. I started having problems with my powder measure so I removed the screw that wouldn't stay tight and took it in expecting a new screw. They handed me a brand new complete powder measure and apologized for the inconvenience.
I moved to Iowa and had a problem with my primer feed base. After many many times of removing the base screws, the holes finally stripped. I called Dillon's expecting something less than an "in person" experience. Not so. They promptly sent me a complete auto-primer feed unit, not just the repair parts, free.
The only other company I've delt with that offers this level of customer service is Brownell's in Montezuma, IA. It's a real pleasure to know that some companies really care about their customers and will go to extremes to make them happy. Yes, there are probably better reloading presses on the market but Dillon will get my business because I know they will take care of me.