Interlocking - Pin-Hole

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Pin-Hole Variation
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Designer:Stewart Coffin
Craftsman:Stewart Coffin
Material:Cherry (Pieces) & Birch (Dowels)
Pieces:6 (standard)

The standard Pin-Hole has six 1x1x3 bars with holes and dowels. By extending the bars, more complicated assemblies like the one in the 2nd photograph are possible. Stewart made about 50. Number 20 in his numbering system.
More information in The Puzzling World of Polyhedral Dissections