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

Now here is where a movement pad comes in very handy. You see the order number 5394 just next to the bracelet. I am not endorsing Bergeon as a brand, but once you have started using one of their movement pads, you will not want to go back trying to get a firm hold (especially true for domed crystals and this DaVinci has a slightly domed Sapphire crystal) on the without it. The movement pad is cushioned, you can clearly see that I am pressing down on the watch (near the front left side of the bracelet above "Bergeon"). Movement pads are also great to turn around automatic watch movements in the case after having them serviced or changed hands with the crown stem removed. As I said earlier, you can do it without, it is just a lot more convenient with a movement pad.
The 1.0 mm screwdriver with a fine sharp blade (other calibers might require other screwdriver sizes, I recommend you buy at least the sizes 0.5 or 0.6 mm, 1.0 mm and 1.2 mm for starter watch works. The PMWC Starter Kit offers these sizes together with most tools beginners will need for a good start into watch tinkering! A good start is essential because scratched watch backs and other mishaps will most likely kill your initial motivation to give basic watch making a try. The starter tool kit is not a big investment and if you turn away from watches, you could still use most of its tools to fix electronics, children toys or other precision instruments in your household or office.
Watchmaker screwdrivers as most precision screwdrivers have a rotating widened top so you can conveniently place your index on top of it and hold the screwdriver with thumb and middlefinger for optimal control. Now we are almost done, but first we need to check the O-ring (in this case in the case back, many watches have O-ring grooves around the case) and we also need to clean both the edge of the watch case and the edge of the case back to make sure the case back snaps back perfectly not leaving any gaps for humidity or dirt or dust to enter.

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