Steven Penner

I think working in industry trains alot of people with good practices: No jewelry, no exceptions. I think the third photo is my favourite, you can still see the ring jammed in under the skin gathered at the knuckle.

The Hardware Hut - Product #KAB-5021XKWL-26D-41 - KABA Ilco Simplex 5000 Series Heavy Duty Mechanical Push-Button Door Lockset (Dull Chrome) I would visit my local locksmith (or building materials recycle store) for something like this. It's simple and fully mechanical. It's entirely possible that they have used units available from somebody upgrading to the electronic models. Yes they are expensive new, but they are a commercial quality lock made to last repeated and constant use. We just changed a residential quality lock at home because the knobs were only staked on sheet metal and pulled off.