| 摘要 |
PURPOSE:To obtain an inserting core having no fear of separation from a machine screw and easy to product by a method wherein a machine screw having a male screw and relating to the outer circumference of core is fitted on a stick-type inserting core for tuner having a groove for driver. CONSTITUTION:A machine screw 24 having a male screw 23 at a part of outer circumference is fitted on a inserting core for tuner 21 having a groove for driver. In this constitution, as the machine screw 24 is related to the outer circumference of the core 21, the discrepancy of center axis between the machine screw 24 and the core 21 is prevented, and the insertion work can be made to be easy. |
