A good clean up then a small amount of two pack JB WELD would be my favourite. Advantage is you can build up some around the outside to help keep it in place and it's grey in colour (sorry, color) so you can't see it very much against the aluminium!
Surely you mean ALUMINUM old chap?
.
Sorry, just being fascecious(did I get that rigth?), we all know the Yanks can't spell. I should know, I'm half Limey/half Sptic. No wonder I wander through life in such a bewildered state. Even worse now it seems the dear old Bullet may be no more from next month on, someone PLEASE tell me it's not true. I don't have thereadies to buy one just yet, I'll end up paying a bleedin' fortune
.