Referring now to FIGS. 8-11, cylindrical pin 26 may now be slid through the upper apertures in plates 22 a, 22 b, and through aperture 28 b. (Depending upon the particular application, instead of pin 26 various securing devices such as but not limited to straps or chains may be used.) Locking pin 29, a round roll pin which may be hammered into place within pin 26, for example, may be located on th