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LEGO PART 18897 Brick Round 6 x 6 with 4 Side Pin Holes and Center Hole | Rebrickable - Build with LEGO
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LEGO part 95188 - Dark Bluish Gray Brick, Round Corner 6 x 6 with Slope 33 Edge, Facet Cutout at BrickScout
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LEGO Part 6222 Brick, Round 4 x 4 with 4 Side Pin Holes and Center Axle Hole [Dark Bluish Gray] (4211097) | iBricktoys: LEGO shop guide and database
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Squaring the Circle: Building Round Shapes Using LEGO - BrickNerd - All things LEGO and the LEGO fan community
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