Brass Button


Clamp the driver in a vise edge to edge. Put a drop of flux at the base of the spring. Apply the iron to the base of the spring and driver. Grab the spring by the cross bend on the top and twist it off when the solder melts. Solder has a high surface tension and will resist a straight pull more than the twist. Pretin the button bottom. Brass does tarnish so you might consider buffing the solder surface against some fine sandpaper or emery board. This will prevent a cold joint and reduce the time spent heating the driver. Hold the button down in place with a blunt stick(headless match stick is good) and apply the iron until the solder melts and the button drops against the board. Keep the stick in place as you remove the iron or the button will come away too.

It is pretty easy, just preheat the brass button, place it on the driver and touch it with the iron for a couple seconds. Make sure you have decent amount of soldering and flux on the driver surface.

I have done this on several lights, and in some of them doesn’t work, because of:

  1. The rear spring does not offer enough force to keep the battery from rattling and accidentally changing modes.
  2. In case of a 26650, because of the weight of the battery, the light would change modes every time I stand it heads-up on a table. And the spring was very strong.

However it works very well on 16340 and 18350 lights where is battery is much lighter.