Hi, Here's a small discussion and suggested fix for the often defective, Casita Travel Trailers interior push button rim locks used on all interior cabinets. While they will be happy to send you free replacements for defective ones (while your unit is under warranty), it's often easier (10 min.) to just "fix" the little buggers, with the help of steady hand and a Dremmel Tool, fitted with a 4mm Burr head... especially if you are on the road. FYI.