| 摘要 |
PROBLEM TO BE SOLVED: To reliably assemble a first part to a second part with no backlash. SOLUTION: The width W1 of the root portion of an elastic piece 16 is made larger than the width W2 of the tip of the elastic piece 16, thereby the strength of the root portion of the elastic piece 16 is increased, the elastic piece 16 can be protected from breakage or damage, and the durability of the elastic piece 16 is improved.
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