This happened to me several years ago when I first got my barrel closing tool. In my eagerness to try out my new tool, I closed the cap without the arbor.
I don't quite remember how I opened it. I might have used compressed air to pop the cap off. I sometimes use compressed air to open those "sealed" Seiko barrels.
Welcome @Boggie46. I would encourage you to take a little time to learn the terminology of watch parts, e.g., "winder rod" is the "stem." It will help us to help you.
I am curious as to how you removed the center seconds wheel.
I do believe in one of the manuals I saw for the 2892 DD module, you could unscrew it from the 2892, and submerge the whole thing in your cleaning machine as a single unit. I havent tried that yet, but when I was having issues with my Omega 1140, I got lucky and found a brand new one in Poland, and ordered that. So, if someone needs parts from an 1140 Omega/2892, I have the chronograph module in my parts bin, although its disassembled.
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