Piece of thin cardboard (not the corrugated type), about 30x30cm
2
用瓶盖的内圈，在薄纸板或无酸水彩纸上画一个圆圈，并用剪刀剪出来。
Start off by tracing the inner portion of your cardboard and cut out the circle.
3
无皮带轮的发电机运输时得有一个薄纸板制作的管或是安装上垫圈以防运输时转子损坏内部零件。
All alternators that are shipped with out pulleys are to have a cardboard tube or spacers installed to as to prevent the rotor from damaging internal components during shipping.
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