Hi, How to disassemble the front of a Beomaster 4400? In the two sides an undersunk screw can be removed but that does not loosen the upper front with the sliders because it requires to also remove the sccress in the middle and they are impossible to grab with a screwdriver - so how to remove the two screws in the middle? A solution could be to remove the whole front but that requires to remove the undersunk screw hidden behind the upper front part? Looking in the service manual does not help. Any good suggestions? /Pindsen