My 1/8 drill was 12″ long. It cost about $7.00 on Ebay two years ago. I broke about an inch off the end clearing out one of these drain holes. (Shorter drill still works.) The problem is that you may not be able to see the end of the drill going past the exterior drain hole. Vertical and horizontal holes may not line up exactly. If you do drill thru into the gearbox an epoxy repair can be done. Best to proceed very cautiously and not use a power drill. I like a separate loose chuck to get a grip, pull the drill out often and clean the flutes as you go.
