With the current horizontal outer/spindle uniball mount craze taking over (ie: H&M, Camburg, Donahoe, etc.), it is likely my next setup will include this feature. My question is: what maintenance, if any, is required on a spherical bearing? Assuming these shops use the Teflon lined type (size?), what is the lifespan? How often will a daily driver need uniball replacement? Also, what would be the advantages/disadvantages to using a rod end or spherical bearing for the inner mount of an upper control arm as opposed to a Delrin bushing?