old FLASH dismantle Answered

hi to all

hoping that someone can help me to dismantle old flash unit i have.
i need to do it, so variable resistor can be inserted inside, and to get some speed :)

the model is VITACON 988, very similar to this one:
img4.imageshack.us/img4/5867/b4bmgfqbwk28kgrhqfhseyc.jpg

I found only 2 scres on the very bottom, and still not succes to open.

PLEASE HELP ME !