Saliva constantly flows from the salivary glands in your mouth. Sometimes, the chemicals in saliva can crystalise to form a tiny stone. Salivary gland stones ('salivary calculi') can become lodged in the duct (tube) leading from the salivary gland, blocking the flow of saliva into the mouth. This can cause swelling and pain in the gland.
Hub assemblies and wheel bearings. Located between the brake drums/discs and the drive axle, the hub assembly is mounted to the holding bracket of the chassis on the axle side. On the drum/disc side, the wheel is connected to the hub assembly via bolts. The wheel bearing itself is inside the hub unit.
In the mid â30s, hubcaps became more decorative than functional. The âdog dishâ style was born, chrome hemispheres 9 inches in diameter, covering the lug nuts and the center of the wheel. About the same time, wheel technology advanced and spoke wheels were replaced by wheels formed from stamped steel.