利用Dremel工具和小钻头，在塑料外壳上钻一个小孔。
With a Dremel and small bit, make a small hole in the plastic housing.
螺杆钻具是其中的一项关键技术，其主要目的是研制满足侧钻中短半径水平井需要的小尺寸高造斜率的弯外壳螺杆钻具。
Small size bent housing screw drill with high build rate must be developed to meet the requirements of sidetracking the short to medium radius horizontal well.
螺杆钻具外壳体是螺杆钻具的关键零部件，也是易失效件之一。
The shell of positive-displacement motors is the key component of down-hole motors, it is also a main vulnerable parts.
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