Sorry for digging up such an old thread, but I'm having issues with removing the left hand hex screw: It doesn't seem to be a 3mm?! All four others came out without problems. I even bought a new 3mm allen key in case it was just a bit rounded. The screw head looks fine and I haven't removed any of the screws before, so it's not rounded. Could it be an imperial hex head? Seems odd if all others are 3mm metric.
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