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Set screw insertion 插入固定螺丝The set screw must be used. The use of the set screw is not optional.Assemble the set screw to the set screw driver. Insert the set screw as shown in Figure 61 along the opening of the post of the targeting device and advance it through the nail holding screw pushing the set screwdriver.将固定螺丝安装到固定螺丝刀上。将如图61所示，沿定位装置的立柱开口插入定位螺丝，用定位螺丝刀将其推入。 
Push the set screw driver down until you are sure that the set screw engages the corresponding thread in the nail. During pushing down the assembly, you may feel a slight resistance.将固定螺丝刀向下推，直到确定固定螺丝与头钉上相应的螺纹咬合为止。在推的过程中，可能会有轻微的阻力。Turn the screwdriver handle clockwise under continuous pressure. You may notice a resistance when turning the set screw. This is because the set screw thread is equipped with the “nylstop” system to prevent spontaneous loosening. 顺时针加压旋进螺丝，转动固定螺丝时，会感觉到阻力，这是因为固定螺丝的螺纹上装有“自保持”系统，防止自动松动。This is not the final position for the set screw. Keep turning the set screw until you feel contact in one of the grooves of the lag screw.这不是固定螺丝的最终位置。继续转动固定螺丝，直到感觉到拉力螺丝入槽为止。Lag screw fixation 固定拉力螺钉To verify the correct position of the set screw, try to turn the lag screwdriver gently clockwise and counterclockwise. If it is not possible to turn the lag screwdriver, the set screw is engaged in one of the grooves. If the lag screw driver still moves, recorrect the handle position and tighten the set screw again until it engages in one of the four grooves. 顺时针和逆时针轻轻转动拉力螺丝刀，来确认固定螺丝是否到位。如果不能转动拉力螺丝刀，固定螺丝则与拉力螺钉其中一个凹槽咬合。如果拉力螺丝刀仍能动，调整手柄位置并再次拧紧固定螺丝，直到它与四个槽中的一个咬合为止。
After slightly tightening the set screw it should then be unscrewed by one quarter (¼) of a turn, until a small play can be felt at the lag screwdriver. This ensures a free sliding of the lag screw.拧紧固定螺丝后，应将其拧松1/4圈，直到螺丝刀可以感觉到很小的间隙。确保拉力螺钉的自由滑动。Make sure that the set screw is still engaged in the groove by checking that it is still not possible to turn the lag screw with the lag screwdriver. 检查拉力螺丝刀仍然不能转动拉力螺钉，确保固定螺丝在槽中。Do not unscrew the set screw more than ¼ of a turn.If distal locking is not indicated, the end cap should be assembled to the nail end to prevent bone ingrowth. Leaving the lag screwdriver in place, the nail holding screw is now removed using the ball tip screw driver or universal socket wrench and turning it counter clockwise，insert the end cap (size 0) using the socket wrench or the ball tip screwdriver. The end cap should be tightened slightly. 如果远端未锁定，应将尾帽装到钉端以防止骨向内生长。将拉力螺丝刀放在适当的位置，使用球头螺丝刀或万能套筒扳手逆时针旋转拆下主钉固定螺丝，用套筒扳手或球头螺丝刀插入尾帽（尺寸0），并拧紧。Please see chapter “end cap insertion”. Alternatively the end cap could also be inserted free hand after removal of the target device.另一种方案是移除定位装置后，插入尾帽。请参阅“插入尾帽”一章。
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