Made a small progress. I finally was able to undo the screw where the tripod mount goes. When i looked inside the hole, there is indeed something looks like a flat-head screw (4 or 5mm wide). However, my screw driver can't connect to the screw's rail(is that what it's called?) although the rail is very obvious. When i used the screw driver to feel it, the screw head just feels like a flat piece of metal despite the obvious line marking. I hope I described it correctly. I was worried that my large screwdriver is too thick to fit, so I tried my thin jewelry screwdriver. Still, it won't fit. *****head scratching****
-------------------- Barska X-Trail 15x70, Jason Empire Mercury 10x50, china-brand 15x60