| 摘要 |
A spring abutment is threaded on an adjusting screw, which is carried by a binding element member, in which the spring abutment is mounted to be nonrotatable and displaceable in the axial direction of the adjusting screw. The adjusting screw comprises two portions having the same handed screw threads of different pitch. One of said portions carries the spring abutment and the other screw-threaded portion of the adjusting screw is threaded into a tapped hole of the member which carries said screw.
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