How to replace this lamp?

[Megawatt]

Hello, so I have this lamp which got burnt today:
View attachment 63815
And it has this strange screw which I can't unscrew with any wayView attachment 63816what do I need to unscrew this? Thank you

If all else fails drill it out

 

[telectrix]

If all else fails drill it out

I was just about to say get the hammer out. I've removed many a reluctant screw with hex/torx.etc head with sidecutters. 1 point inside and 1 point outside. squeeze and turn.did 1 the other week on a leccy meter, with half the screwslot sheared of by a meter monkey. did it live with a mate with a lump of 2 x 4 to knock me over if I started spasming.