I have done it using an 1,5 mm cross slot screwdriver from a screwdriver set by LIHAO (I bought it at Amazon). First, ensure that the screwdriver is well fitted into the screw head, then press down and try to turn it(without forcing it!). If the screw does not turn easily, stop, take out the screw driver and repeat the process till the screw get loose. Be patient, take your time and keep in mind that your main priority is to preserve the heads of the cheese screws
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