My window handles are defunct. The locking cylinder is missing from one, and the cylinder is loose and falls out of the one pictured. They are both locked shut permanently. Two screws hold it in place, one is accessible but the other is not. There is very little clearance to insert a tool to remove the bottom screw and the handle cannot be moved since it is locked shut. The clearance is about 5mm (shown in the second picture). Is there any specialist tool that could remove this screw?