| 摘要 |
A spring fastening member includes two arms that can be engaged in a tube. A first protrusion and a second protrusion are respectively disposed at two corresponding sides of the spring fastening member in a direction away from the two sides of the spring fastening member when the two arms of the spring fastening member are forced to being parallel to each other. At the two corresponding sidewalls as viewed in a radial section of the tube, a first hole and a second hole are respectively disposed there for allowing the first protrusion and the second protrusion to be inserted there through. A first distance is defined between central axes of the first protrusion and the second protrusion, a second distance is defined between central axes of the first hole and the second hole, and the first distance is not equal to the second distance.
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