X axis carriage (single and dual) replacement for Replicator 1, 2 or clones (lm8suu and lm8uu)

X-axis carriage replacement for replicator 1, 2, or clones. This version provide a better belt anchor/lock. There are two main versions one for lm8suu (original) and for the lm8uu, great if upgrading to the igus type linear bearings like "IGUS RJ4JP-01-08". Also since the belt is now locked from top of the carriage the 3D printer parts is more rigid/solid; a 3D printer part of the original can brake easily. The lm8uu version is asymmetric by design, 1) the limit switch is on the right side and i