| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to easily carry out the assembly and disassembly of a trigger lever and a trigger lever return spring. SOLUTION: The temporary fitting part 429 of the trigger lever return spring 421 is integrally molded at a boss part 84a for insertion to a fulcrum shaft of the trigger lever 84. The trigger lever 84 and the trigger lever return spring 421 may be assembled the one time in the state of fitting and temporally taking the trigger lever return spring 421 to this temporary fitting part 429.
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