Removing innards of cam style baggage door locks

[mbubbaca]

Hi, I have ordered my replacement cam style locks from Vintage Trailer. They should be here soon. In the meantime, I've removed the locks. I had to measure them to order the right size. My problem is how to remove the inside piece so I can replace it.
The key will not turn, that was my clue that I had a problem. I entered the locker from the inside by removing the panel that supports the twin beds and the nightstand/drawer. That opened it up for easy access to the space. I was able to then remove the Phillips-head screw and latch.
I removed the star ring that holds the shaft to the door panel so everything came apart nicely. But before I get my replacement, how do I remove the old one? I'll get pictures later today if that will help explain where I'm stuck.

[mbubbaca]

Here are some pictures

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I just recently rebuilt my similar lock on a 2003 model. Place the pictured part with the key side down and use some penetrating oil around the cylinder. Let it soak for awhile. Then, use the key in the lock to try turning the cylinder until it moves. Use light pressure against the screw hole end (finger will do) and the cylinder will come free when the shoulder alines with the clearance slot. It is a long "L" channel on it's side. The friction/resistance to movement is corrosion between the barrel and outer side.