1·If the substrate is metal, I sand blast it when possible or use 80 grit emery paper as a second choice.
如果基板是金属，如可能我就喷砂或者，作为第二选择80粒度的金刚砂纸。
2·Lightly scuff sand flywheel face with 180 grit emery clothed clean surface with a wax and grease remover.
以180号金刚砂布轻轻打磨飞轮表面。然后以除去蜡与黄油的去污剂清洗表面。