John - I replaced the door knob in my Bambi with Bargman "Motor Home Double Latch Lock" from Campers Choice ($35.64). I added a dead bolt (Weiser - $17.85) at the same time. You can look at both of them at http://www.camperschoice.com. I've had them for 3 years now, and have been pleased. Sherry '63 Bambi