I find quite a bit of info about the PCNC spindle rebuild but not so much on the 1100m. Tormach does not provide rebuild instructions for or a diagram of the 1100m spindle. Is the bearing arrow direction the same on the 1100m as the PCNC? The 1100m spindle has a spacer tube between the inner races of the two bearing sets and the outer races of the upper bearings "float" up and down in the tube. The lower bearing is held captive in the tube with a plate and allen heads.
Andy