A laser pointer, for all its sophistication, relies on a push button switch to work. The constant pushing of the button can result in it breaking and rendering the laser pointer useless. Repair a laser pointer whose switch has broken by replacing the switch. The procedure is straightforward--similar to that of replacing a switch on a disposable flashlight--and does not require any special skills. A few common household tools and a replacement push button from a hobby store or electronics shop are needed.
Unscrew the battery cap from the back end of the laser pointer. Remove the batteries from the battery compartment.
Unscrew and remove the reflector from the front of the laser pointer.
Clamp the jaws of the needle-nosed pliers around an edge of the laser module that is inside of the front of the laser pointer. Be sure not to touch the laser diode that is at the module's center. Pull the laser module out of the laser pointer using the needle-nosed pliers.
Place the laser pointer horizontally on a table with the push button facing up. Insert the tip of a flat-edged jeweler's screwdriver into the seam between the push button and the laser pointer's casing on any side. Wiggle the tip of the flat-edged jeweler's screwdriver to loosen the push button. Repeat this procedure around the push button.
Pull the push button out of the laser pointer's casing until there is sufficient room for grasping a corner with the jaws of the needle-nosed pliers. Pull the "On" button out of the laser pointer. Discard the "On" button.
Wipe the hole with an edge of a lint-free cloth. Insert a replacement push button into the hole now vacated on the laser pointer. Press the replacement push button into the hole with your fingers until it is seated snugly inside the laser pointer's casing.
Reinsert the laser module into the front of the laser pointer. Screw the reflector back onto the front of the laser pointer. Reinsert the batteries and screw the battery cap back onto the back end of the laser pointer.