Technic Ball Joint with Through Axle Hole : Part 53585 | BrickLink
A simple fix to give the Toa Mata/Nuva neck articulation, all you need is some mixel ball joints! : r/bioniclelego
Bionicle Joints | Bionicle Parts | Ball Socket | Diy Toys | Blocks - 10pcs/lot Parts 90607 - Aliexpress
Lego Bionicle Spare Parts | Old Bionicles Sale | Bionicle Blocks Parts - 10pcs Figure - Aliexpress
You can print Bionicle ball joints! : r/3Dprinting
Its new to me: stiffening the joints with Element 74261/6106472 (Element Exposition) | The Rambling Brick
LEGO part 60896 - Black Bionicle Arm Av-Matoran with Ball Joint and Ball Socket at BrickScout
Kockajáték LEGO
08 sockets at their worst. It was only connected to a ball joint three times as I got it when I brought a sealed click polybag. And Lego still has the moulds