" This joint is designed for those seeking a tight, maintenance free, extremely high quality joint with maximum misalignment capabilities. It uses a high-quality, precision, spherical bearing and trick custom-machined misalignment spacers held in a tubular cartridge body much like the RE bearing. However, the bearing has neither provision for lubrication nor pre-load adjustment as it is PTFE lined and factory-set. This means that because the bearing is a self-lubricating precision assembly, pre-load adjustment and lubrication are not required, either during initial assembly or throughout the life of the joint. In most cases this is an advantage: you need not guess at an appropriate pre-load setting - the bearing is already set for maximum strength and durability - and periodic re-greasing isn't required. However, some users may feel more comfortable with a joint they can adjust and grease as required. The catch is - you have to actually do it. Much like the age-old argument surrounding sealed vs. greasable U-joints - the greasable joint is only advantage to those who religiously do so. If you're inclined to neglect maintenance from time to time, you're probably much better off with a self-lubricating, factory-set joint like the Uniball.
The Uniballs are a high-end joint that combine the best features of traditional high-quality Heim joints (precision, maintenance-free bearings) with the benefits of a cartridge joint (ease of use - just weld to tube and go. Rebuildability - the bearing can be replaced without having to fabricate a whole new link). Mix in the trick missalignment spacers and you have a unique and compact joint.
Compact, strong, precise, and capable of wicked articulation this joint is an excellent choice for top-end buggies and other rigs seeking maintenance-free high-end performance."