Fastener with wings
grabcad
The given design is beneficial when access to the underside of the lower plate is restricted. Initially, secure a nut on the bolt and pass it through the holes of both plates. (Step 1) Next, use a hexagon key in the bolt's hexagon slot to force the rod downwards, expanding the wings beneath the lower plate. Concurrently, grip the nut with a spanner while turning the hexagon key until the plates are tightly secured. (Step 2) This design is exclusively achievable through 3D printing.
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