nut 84 a collar 76 is attached by appropriate means to curved plate 74 preferably using a pair of bolts 86 and nuts 88 collar 76 has a first face 92 and a second face 94 joined together to form a bearing housing 96 having a plurality of ball bearings 98 therein bearing housing 96 has a sleeve 78 disposed therethrough as shown a channel or groove 102 is formed in sleeve 78 for engagement with ball bearings 98 thus allowing sleeve 78 to rotate freely with bearing housing 96 as shown the length of sleeve 78 is slightly greater than the width of collar 76 and therefore sleeve 78 extends just beyond the planes defining the edges 104 of collar 76 therefore when holder 26 is fixably attached to curved plate 74 as shown sleeve 78 extends through a hole 106 formed in curved plate 74 also the configuration of sleeve 78 within collar 76 allows holder 26 to be fixably connected to sleeve 78 so that holder 26 and sleeve 78 rotate with respect to collar 76 curved plate 74 and belt 22 holder 26 is preferably connected to sleeve 78 using a large bolt 112 washer 114 and nut 116 arrangement as shown other suitable connecting devices that are freely rotatable and yet can secure a holder of bricks to a belt can be used as well an alternative embodiment according to the present invention is illustrated in fig8 and 9 this embodiment is somewhat simpler and potentially lighter in weight and to that extent may be preferred although the holder used in this embodiment does not have the capability of swiveling this embodiment.