Kato coupler screws- what is the trick?

[Anonymous]

I have an almost impossible time unscrewing these, usually having to use needle-nose pliers to untwist these as my screwdrivers tend to strip the head. Is there any special trick to undoing these? They seem to be welded in place!

[SpaceMouse]

Get the tightest fitting screw driver that will fit the screw. If you've already buggered up the screw, you might be able to cut a new notch with a dremel tool.