How can I remove the wires from this lamp holder?

Question

The wire on my lamp is too short, so I'm trying to replace it. The fitting/fixture (what's the correct term?) however doesn't play nice: I can't see the correct way to remove the old wire (and still be able to insert the new one).

I'm not seeing any screws at all, so it must be some sort of clip thing. I'm not too comfortable applying too much pressure to the plastic, as it might bend/break, before I know I have the correct point to insert my screwdriver.

Some shots (I can provide more obviously):

Answer 1

I think I found the mechanism: There's a small hole to insert a screwdriver or something, which kinda keeps the wire in place. One of the wires required a bit more force then the other, that's why I was confused, but this seems to do the trick:

Answer 2

Instead of messing with the lamp socket, I suggest you just cut the plug off and splice in a longer cord. The lamp socket is probably the most engineered part of that lamp, taking in to consideration things like heat, part movement due to expansion, etc. Who knows what specifications that wiring has.

I recommend getting some butt splice connectors and some heat shrink and lengthening the cord instead. Make sure you use a wire gauge at least as large as the existing wire, or preferably bigger.

Answer 3

I have a similar fixing that I need to replace. There is a sprung contact adjacent to the hole for the conductor. Pressing down on the spring releases the wire. In this case bootlace ferrules have been fitted to the conductors. These can catch when removing the wire so you need to keep the pressure on the spring. Perhaps a two person job if you don't have a vice or similar to hold the fixing. I suspect you could insert a solid conductor without opening the spring. May be the same if you fit a ferrule to stranded wire. I think the key is to press just enough to insert the wire. Hope this helps.