WS 25 Battery change on MechaQuartz IWC Caliber 631 R397 (SR726SW)

Be careful with Q-tips! Use them only on invisible steel surfaces. If you have ever looked at cotton fibers unter large magnification, then you will have noticed, some of the fibers look like blades. And indeed, you can easily leave visible marks (under 10 x magnification) on even a polished steel surface. So please use Q-tips with utmost care. Check how much pressure they can take before pressing them down. There are many different types of Q-tips out there and you do not want to drive the tip into the movement. Because there is another problem with Q-tips, the lose fibers very easily. Please make sure that you hold the tip in a way that fibers will drop outside the watch case. Always check with a strong loupe for fibers and remove them with fine tweezers. Do not  use the camera or watch dust blower now. At least I made the experience that after cleaning with a Q-tip, blowing into the watch case might transport fibres right into the dial or the crystal. It is one of the most frustrating experiences to have to reopen a watch, remove the crown stem, take the watch movement out and try to remove those fibers or other specks that you might have removed using a dust blower. The dust blower is a good tool to make sure the inner case back is clean but please use it with care otherwise. I also blew away a luminous dot once with a dust blower. But that is an entirely different story.

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