Hmmm.... Perhaps it is because it's an older binoculars. There is no flat screw inside the hole where the tripod mount goes (this binoc is not tripod adaptable but I know which hole you are talking about). So, i also undid the screw on the opposite side of the hinge (between the oculars/eyepieces). Still, i can't withdraw the two arms.....
-------------------- Barska X-Trail 15x70, Jason Empire Mercury 10x50, china-brand 15x60