The design of optical mounts and adjustable mechanisms is a complex process, which requires collaboration of experts from various disciplines. Many small organizations can not afford to have in-house experts to perform complex optomechanical design tasks. A user-friendly knowledge-based expert system has been developed to guide a novice optical engineer in selecting optimum mirror and lens mounts, and adjustment mechanisms for a particular application. The system consists of pictures and design database of several optical mounts and adjustment mechanisms. Based on the user defined specifications, this expert system searches the database, and presents a list of suitable devices for the application through an inference process. This expert system can also be used as training tool for entry-level optical and mechanical engineers.