Yes they are usually glued in. You need some heat and a Japanese Crosspoint screwdriver. Those are not Phillips heads. If your lens has the same fine ribbing on the aperture ring and no screws in the lens mount, the Dremel will cut it, but it still won't work as there is not enough "meat" to hook the AI tab on the camera. Use a soldering iron to apply heat to the screw head to soften the thread locking compound.