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In some cases, micro-switch or soldering have caused pre-travel of the side button. To fix this, we provide optional side click parts to reduce the travel distance. The contact face of this optional part is thicker than normal (+0.5 mm). This optional part is cut off at the end as shown in the picture, so it can be distinguished from the normal one. **
The DPI button can be cut away with a cable cutter or preferably desoldered.