apparatus is disclosed herein for adjusting the length of a frame to fit a canopy tied onto and stretched over the frame . each end of the frame includes a mounting bracket which is slid into an open end of a side tube with a friction fit . a sleeve is secured over the side tube with a flange engaging the outer end of the bracket . an adjusting nut and bolt engages both the flange and the bracket such that rotation of the nut against the flange causes the bracket to be moved axially within and of the side tube thereby lengthening the overall length of the frame relative to the canopy .