Replacement Instructions: (1) Use a large yellow screwdriver to loosen the screws on the 4 case and remove the original watch band case. (2) Install the steel case and tighten the four short case screws. (3) Attach the steel strap and tighten the 4 long strap screws with a small red screwdriver. Note: When installing steel case screws, install two diagonal screws first, for balance and fixation. When installing screws on one side of the steel band, insert two screws first, fix the position, then tighten.
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