Product voltage, output shaft size, electrical performance, can you request custom-made.

产品电压、出轴尺寸、电气性能，您可以要求定做！

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Optimization of Shaft Size and Centralizer Span of Single Screw Pump in Declined Oil Well. Chinese Journal of Computational Mechanics. 1(19):58-62.

隋允康、任旭春。斜井单螺杆抽油泵柱和扶正器间距的最优设计。计算力学学报，2002，1（19）：58-62。

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Can be used to increase the size of the core shaft, allowing to play the role of the support spring.

可以使用加大芯轴的尺寸，允许同时起到支承簧圈的作用。

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Leandro Erlich's "Stuck Elevator" (2011) is more complex: A freestanding box, about the size of an elevator shaft, it reveals, through an open door, the elevator's lifting mechanism and, through a gap at the bottom, the interior of the cabin, with a newspaper on the floor.

WSJ: Too Clever by Half | More Real? | Minneapolis Institute of Arts | By Peter Plagens

Beware of buying golf clubs for your giftee, unless you have very specific marching orders, such as a particular new driver model with a certain shaft, loft, lie angle and grip size.

WSJ: What to Get a Golfer for the Holidays | Golf Journal by John Paul Newport

Inside, in a space not much bigger than a three-car garage, was a single shaft-painting machine, a work station where clubs were cut to size and grips attached, and racks containing 40, 000 to 50, 000 shafts and 5, 000 clubheads.

WSJ: Psst��Wanna Buy a Counterfeit Golf Club? | Golf Journal by John Paul Newport