are to individually receive each of a pair of stub pivots 26 fitted therein the stub pivots 26 extend oppositely outwardly from the ball end 22 of the bent tube 23 and are to fit into individual pivot cavities 25 so arranged as shown best in fig3 and 4 with the pair of stub pivots 26 each fitted into a pivot cavity 25 a cap 27 having a center hole 28 formed therein is slid along the bent tube 23 to where threads 29 thereof can be turned onto the outer threads 24 of the collar 20 a with cap 27 turned onto collar 20 a the positioning of the stub pivots 26 in the selected pivot cavities 25 is maintained setting the positioning of the sander body 11 relative to the bent tube 23 which positioning however is preferably not rigid in that the diameter of the hole 28 through the cap 27 is selected to be somewhat larger or greater that the bent tube 23 diameter as shown in fig1 and 5 allowing for some pivotal movement between which sander body 11 and bent tube 23 as during use of the sander to minimize damage to the coupling should the sander u201c stick u201d to the wall surface so arranged the sander body 11 is selectively positionable relative to the bent tube 23 to facilitate the sander 10 being moved up and down or side to side or at an angle therebetween as the operator desires the bent tube 23 preferably has its end 23 a shown in fig2 fitted into a coupling end 31 of a vacuum pipe 30 as shown in fig1 through 7 which coupling can be by providing interior threads not shown formed in the coupling end 31 for.