Casio W-800h Mod Today

Locate the specific solder bridge/jumper on the back of the PCB (often labeled near the jumper pads).

This is the most ambitious and risky—yet visually stunning—mod. The concept comes from professional dive watches like the Sinn UX, where the case is filled with a clear liquid (usually silicone oil) to maintain legibility under extreme pressure. The mod involves removing the watch module and battery, submerging the case in silicone oil, and reassembling it underwater, ensuring no air bubbles remain inside. When done correctly, the result is a watch with no "air gap" between the dial and crystal, leading to unreal legibility from almost any angle. In theory, it can also greatly increase the watch's water resistance by eliminating internal pressure differences. However, this is a high-risk, high-reward mod that can easily ruin the movement if the wrong oil is used or if not executed perfectly. casio w-800h mod

Locate the column of solder jumpers on the right side of the PCB. Locate the specific solder bridge/jumper on the back