A retention assembly for a jack is disclosed. The cantilever includes a first extending portion and a second extending portion bent vertically from the first extending portion. More particularly, the invention includes methods and structures to detect and improve the component placement accuracy on a target platform by incorporating alignment marks on component and reference marks on target platform under various probing techniques. The two pendulums fixed at both ends of the main shaft may be adjusted at different angles. The wired circuit board is bent such that the conductive pattern is warped, and by the reaction force of the warping, the terminal portions and the external terminals are abutted, and the electronic component and the wired circuit board are electrically connected. This new variety of Indian basil was developed through open pollination in the germplasm followed by half-sib progeny selection and evaluation for the yield characters of selected population for 3 years in field conditions.