| 摘要 |
PROBLEM TO BE SOLVED: To eliminate detachment attributable to defects of a nut insert. SOLUTION: A spot tip B2 is connected to a pressure horn 5, and an insulating press bar 3 and an elastic spring body 4 which are vertically movable in the spot tip B2 are fitted to the spot tip for the nut insert having a caulking skirt.
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