Abstract: An upright guide bar is provided having upper and lower ends and the lower end include structure for releasable engagement with the upper end portion of an upstanding stake to be driver downwardly. A downwardly opening drive housing having upper and lower ends also is provided and the upper end of the guide bar is guidingly telescoped into the lower end of the housing. The lower housing end includes a downwardly facing abutment surface for downward abutting engagement with the stake upper end and the lower end of the housing includes an interior guide sleeve removably mounted therein through which the guide bar is slidingly received, the upper end of the guide bar and the guide sleeve having opposing abutment surface structures limiting upward movement of the housing relative to the guide bar.