Posted 12 June 2010 - 08:49 AM
There won't be any safety issue as far as danger of an electric shock or anything like that - the voltage on that socket is low and the plug is still in the same position when it's plugged in. It's hard to be quite certain from the images, but I don't think the design of the pins will allow the power supply to be shorted as it's being plugged in, but to be sure, I'd suggest don't plug or unplug the lead to that socket while the mains power is on.
The plastic centre piece mainly served to ensure the correct plug is used and guided it into place giving extra support to hold it straight. Without that there, it might be easier to bend the centre pins or for someone to try to use a wrong power supply, possibly causing some damage. If you know to be careful with it, I don't believe it should cause you a problem.
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