Base gear diameter: 1.44 (36.5mm), Rubber gear diameter: 1.18 (30mm)
Thread diameter: 0.18 (4.5mm)
All rubber gear in Magic bullet are reverse threaded.
To remove your broken piece, you need to use a plier, a thick cloth, and mineral oil or any other oil for lubrication.
Need to give some pressure and strength to unscrew.