5 Start Half Inch Anti-Backlash Acme Nut

Anti-backlash nut.

Notice how the small nuts and bolts attach through and tighten to the first large piece while the bolts are just there to locate the second piece. Make sure the bolts move smoothly through the second piece.

Mounting holes are sized to fit standard Meccano dimensions.

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This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/k5F07F