| 摘要 |
A guiding device has a cylindrical base with a flange around one end. Peripherally spaced radial projections, formed around the base, are axially spaced from the flange at a distance corresponding to the thickness of a main board (10). The main board forms a passage (12) surrounded by peripherally spaced radial recesses (14a-14d). The recesses engage and pass through the radial projections as the base is penetrated through the passage. The base is then rotated to fix the main board. |
