| 摘要 |
An article 3 of relatively low friction material is provided with a relatively high friction insert portion 12 by forming an aperture 10 where the portion is to be located, making the portion in the form of an insert of a different cross-sectional shape which constitutes an interference fit in the aperture, followed by forcing the insert into the latter until only a relatively small portion of the insert projects from the surface of the article. <IMAGE> |
