The small chuck keys that come with corded drills and drill presses are too small to apply enough torque and easily misplaced. I solved both problems by mounting the key in a ferruled, wooden file handle as shown. After removing the cross pin, I drilled a tight-fitting hole in the handle and inserted the chuck key. The final step was to drill a slightly undersized hole for the cross pin and tap into the handle to lock it.
– Kenneth Mesger