Close the empty case. Drill a 1/2" hole in the joint where the lid and bottom come together, making sure that 1/2 of the hole is on each side of the joint. Make sure it's convenient for the tool in it's storage position in the box. Throw the tool in, drape the cord thru the notch that you drilled. Shut the lid. I know - it sounds stupid, and I haven't actually done this - but I've been sorely tempted.