The second version module assembly jigs are developed at KEK by feeding back the experience and issues identified in the first jigs. An overview of the second version jigs, in comparison with the first ones, is presented, followed by descriptions of the assembly station, individual jigs, and step-by-step assembly process. I. INTRODUCTION During the fabrication of first version of module assembly jigs and building more than five precision mechanical modules, including trial ones, we have gained experience and insights into the jigs and assembly steps. These first version assembly jigs and the precision of assembled mechanical modules were reported in the SCT weeks in Nov. 1998  and Feb. 1999 . Having feedback from these results and experience, we have developed a new set of assembly jigs, the second version. This note describes the new set of module assembly jigs and assembly steps. Although the full module assembly includes the assembly of hybrid on the baseboard and wire-bond..