Abstract: An apparatus (10) for adapting a drywall skim box (44) to an extension pole (16) to permit application of finishing compound to joints in locations remote from the user (54), such as in extended or high walls. The apparatus (10) includes a curved arm (24), one end of which is coupled to an extension pole (16) and the other end of which includes a mounting platform (38) for attachment to a skim box (44). The skim box (44) is both rotatably and pivotally coupled to the arm (24) for proper positing on a wall surface (58) to be finished. The geometrical relationship between the position of the skim box (44), the arm (24), and the extension pole (16) results in application of sufficient pressure to properly operate the skim box (44) as it is moved along a joint (56).