I'm sure I'm not the first to post this but, here's a simple way to "bend" a # 40 or 30 drill around a corner enough to get a clear "shot" at whatever hole your trying to drill ...
SNAKE DRILL ATTACHMENT - Designed with a heavy-duty flexible casing and core assembly for longevity. Fits any air or electric drill. Accepts 1/4x28 threaded drill bits and other accessories for close quarter drilling.