Safe light cartridge

by Oaristys

There is a print in place solderless button battery holder and led light holder with switch mechanism. Rotate the center with a penny to switch on and off the light. Put a little screw on the slot to secure the battery holder so it can switch on and off, but not turn enough to make the battery out for replacing them. Solderless, but add just a bite of soldering on the led mini board binding posts help alot for reliable switching.