Patented specialized auto-lubrification system ensures exceptional performance and output, at the same time as maximum reliability. Thanks to a new rotation system, acceleration and pick-up are improved. Technical features: Compression spring with a 10% larger load. The bushing is made from special case-hardened tempered and ground chromed-nickel steel. It stands out with its large-capacity inner housing, which holds a lubrification tank, inside of which a special spring ensures constant axle grease distribution, even in the most difficult usage conditions. Specially treated inner roller tracks minimise friction