...If this is a Speedmaster Pro with an inner cover, note that the movement is held in place in the case by the case back pressing on that cover - it is not held in with case clamps and screws, so don't turn the watch over or the movement may flop around and you risk damaging the edges of the dial. The cover itself can be tricky to remove for a novice, and sometimes requires prying off the enlargement ring - only do this from the pusher side, again to prevent lifting the movement up.
After you have done what you intend to do - hopefully not poking at the movement - then replace the cover after making sure there is no dust on it. Don't touch anything with bare fingers, or you will get permanently etched finger prints on it...
Then lubricate the case back seal with silicon grease, and screw the case back on, making sure the seal doesn't get pinched in the process. Then ideally pressure test it after to make sure you didn't screw up.
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