6. The system of claim 2 , further comprising: a second bearing configured to interface with the fixed support member the first bearing, the second bearing having clearance for the drive shaft extending therethrough; and a spring configured to act on an inner race of the second bearing to facilitate preload of the first and second bearings.
2. The system of claim 1 , wherein the drive mechanism comprises: a drive shaft having a threaded portion; a first bearing to facilitate rotation of the drive shaft, the bearing being configured to support the drive shaft and interface with the fixed support member; and a drive member engaged with the threaded portion of the drive shaft and configured to be fixed to the translatable member to facilitate translation relative to the threaded portion upon rotation of the drive shaft, wherein an angle of misalignment of the bearing compensates for drive shaft rotational misalignment, and wherein a position of the drive member is adjustable upon assembly to compensate for drive axis translational misalignment.