| 主权项 |
1. A device, comprising:
a first piece made of structural material, having a first tip end with a hole therein near a distal end of the first tip end, said first tip end facing in a first direction, and said first piece having a second tip end facing in a second direction opposite said first direction, said second tip and also having a hole therein near a distal portion, and a position of the hole on the first tip end spaced from said distal end by a first distance, and a position of the hole in said second tip end spaced from said distal end of the second tip end by a second distance, said second distance being the same as said first distance, and said hole in said second tip end being at the same position relative to an end of said tip end as a position of the hole in said second tip end, and said first piece also having a first connection area between said first tip end and said second tip end, which forms a structural connection between said first tip end and said second tip and, and a second jutting end, which extends in the same direction as said first connection area, but does not extend all the way to said second tip end, said second jutting end having first inner surfaces that define both a concave surface and a convex surface, and inner surfaces that define a portion of a through hole; and further comprising a second piece made of structural material, having a first tip end with a hole therein near a distal portion of the first tip end, said first tip end facing in a first direction, and said second piece having a second tip end facing in a second direction opposite said first direction, said second tip end also having a hole therein near a distal portion, and a position of the hole on the first tip end spaced from said distal end by a first distance, and a position of the hole in said second tip end spaced from said distal end of the second tip end by a second distance, said second distance being the same as said first distance, and said hole in said second tip end being at the same position relative to an end of said tip end as a position of the hole in said second tip end, and said second piece also having a first connection area between said first tip end and said second tip end, which forms a structural connection between said first tip end and said second tip and, and a second jutting end, which extends in the same direction as said first connection area, but does not extend all the way to said second tip end, said second jutting end having first inner surfaces that define both a concave surface and a convex surface, and inner surfaces that define another portion of said through hole, where said concave surface of said second piece makes with said convex surface of said first and, and said convex surface of said second piece mates with said concave surface of said first piece, and where said surfaces defining said through hole mate with said surfaces defining said through hole of said first piece, where said first and second piece collectively define a complete through hole. |
