| 摘要 |
A body member has a central aperture and a set screw in an arrangement for mounting on the depending tip of a tool. The body member supports a guide engaging roller in an eccentric relation whereby the roller is arranged to be adjustably rotated such that the surface thereof can be positioned selectively relative to the tip. The roller has a grooved edge for guided engagement on the edge of an upstanding guide. The roller in its eccentric support is arranged for various types of guide functions including roller engagement of a guide, a rolling engagement on a workpiece, or an out-of-the-way position for guided engagement of a support therefor against a guide.
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