It's a bit tight on space, especially the angle to get the drill level. I think the only option is a Dremmel with the flexi dril bit. Iknow where I can get a Dremmel from but no the flex bit.... Arse.
There might be a possibility to use JB Weld liquid metal but it's softer than the makers would have you believe and I'm none too sure where to get it from.
Cheers anyway,
Ali