Lego - 1x1 Stud Brick With Stud on 1 Side - 87087 - Pick Colour & Pack Size- NEW | eBay
What is the interference lock offset of a LEGO stud/hole such that it fits snugly into another piece? (i.e. What are the snap mechanism dimensions?) - Quora
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Lego Specifications | Orionrobots - Learn to build robots at home