Hara chuck

I picked up a small Japanese bench type drill press. Good for my small garage and a good buy even though the manufacturer only makes very LARGE computer-controlled (so what else is new?) production machines now, which explains my problem. Has a brand name "Hara" chuck, 13mm. The key was obviously not made for it and while it will do the job it's gonna eventually ruin the chuck. Any suggestions for finding a proper key for it or should I just buy a new chuck? I'm thinking it's gonna have to be option 2. If so, another question: I've never swapped out a chuck before and have no clue how to do it. Can someone enlighten me or give me a link that will help me learn? TIA. Vic