Reaching out through the block 10 from top a day and a half base 50 is a couple of openings 60 and 62 that are situated equivalent separation from each individual side 12 and 14 of the block 10. The openings 60 and 62 are situated in a plane that is corresponding to a subsequent plane containing shoulders 22 and 24. On the far edge of block 10 is found another pair of openings 64 and 66 that are found similar good ways from their individual sides 12 and 14 as the recently referenced openings 60 and 62. Additionally, openings 64 and 66 are situated in a plane that is corresponding to a plane containing shoulders 32 and 34. The distance between the recently referenced plane containing openings 64 and 66 and the plane containing shoulders 32 and 34 is equivalent to the distance between the plane containing openings 60 and 62 and the plane containing shoulders 22 and 24.