I have an older Central Machinery, 16-speed, Heavy Duty, floor drill press. Model #1058; 1 hp motor; stands about 5' tall; about 9 3/4" swing; has a Jacobs #79/k chuck, 1/8" to 5/8"
or 3 to 16 mm.
I have been unable to source a new chuck key. I have been getting by with the wrong size key since...