The Model 12 has a reputation for being extremely
difficult to open. Most Model 12's display some sort of 'nibbling' around
the top slot where people have tried to open them, to replace either the
bulb or batteries. I have found a much easier (and safer) method of
opening which I demonstrate below.
Never exert too much force or you risk cracking the plastic or slipping
and scratching the plastic.
Fig 1. Using a fairly broad
screwdriver, insert the tip about 2mm and gently raise the cover, very
Fig 2. whilst using the screwdriver as a lever, gently
pull the cover of the viewer away until the catch de-latches.
NOTE: You do not have to raise the cover very much to achieve this.
Fig 3. Finally pull back the cover,
detaching the two retaining lugs that are located at the bottom.
Fig 4. A close-up of the top latch
Fig 5. A close-up of the two
retaining lugs found at the bottom of the battery cover
Reassembly is simply a case of
replacing the cover starting by locating the lugs at the bottom and then
gently clipping the two halves back together. Never use excessive
instructions at your own risk, I cannot take responsibility for any damage
you may cause