A method for creating and using reference images in a defect detection or location system which receives a plurality of learning images containing objects of interest and creates at least one reference image output. Wind clips can be installed to hold the assembly in position in high wind conditions. The first retaining structure and the second retaining structure are located at the first extremity and the second extremity, respectively, and the retaining structures are different from one another. Active elements are operatively associated with reactive elements to produce relative movement between the first elements and the first path, with the active elements controlling the relative movement. , by adjusting at least one variable gain element within the oscillator to obtain a target amplitude andor non rail-to-rail signal swing for the oscillator signal. In another embodiment, a detent system is positioned between a fastening tab and the locking clip.