Your wish to use the 2 AA batteries is not possible as the white LEDs needs 3.5 volts. Moreover, when I got the special battery box (with an ON/OFF switch), the size is bigger than the 9volt battery. So, this circuit uses 9volt batteries. Ha ha ha ha.
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The black box was for the 2x AA batteries which cannot be used now
The two small dots are the 5mm LED holders. You have to open it up
to get the two pieces. Slip the ring inside the LED and then push the
other piece through the hole and insert the LED into it. Then push the
ring into the whole assemble to lock it into place. But this works only
for plate thickess of about maximum 2mm, I think. Otherwise, super
glue would be the best alternative.
Photos courtesy of blueyebabe's Canon Powershot A400
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