| 摘要 |
It has a screw 1 provided with a head 2 with a radially projecting knob 3 which engages with a numbered wheel 13, having the same number of teeth as the turns of the screw 1, whose head has an indicator index 9 which is displayed on a scale 8a graduated in fractions of a turn. Makes it possible to know the exact position of the graduated screw and the tension provided to the corresponding blade. <IMAGE>
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