LEGO PART 47326pat0001 Technic Axle Connector 2 x 3 with Ball Socket and Axle Socket with Black Rubber Insert | Rebrickable - Build with LEGO
Ballshaft! | New Elementary: LEGO® parts, sets and techniques
Its new to me: stiffening the joints with Element 74261/6106472 (Element Exposition) | The Rambling Brick
LEGO® 6360827 67696 - ToyPro
Plate 1 x 2 with Socket Joint-8 with Friction and Ball Joint-8 Lego compatible brick - PrintableBricks.com
Amazon.com: Gobricks GDS-1205 Technical, Axle Connector 2 x 3 with Ball Joint Socket, Open Lower Axle Holes Compatible Lego 93571 All Major Brick Brand,Parts and Pieces (199 Dark Bluish Gray(072),10 PCS) :