This slide shows some design guide tips. When soldering, set the actuator to the release position. This is to make sure the internal spring does not get warped from the higher temperature. Since Panasonic switches are not sealed, do not put them through any washing process. Panasonic recommends using a ‘no clean’ flux or performing the washing process prior to mounting. In addition, after mounting the switches on the board, do not stack them. Stacking them can apply undesired forces to the switch and actuator and could damage them.