Whoever designed my CNC machine built an extremely robust machine with excellent accuracy and resolution.
Unfortunately, the machine was not designed for maintenance! I don't think they knew the word.
Getting to some parts is extremely difficult. By way of example, the spindle motor is upside down and the drive belt is very hard to reach to adjust. The whole Z axis mech is enclosed and a bit hard to work on.
Ah well, it is not designed to wear out, so I take what I have. I have trammed the head well enough.
Cheers
Roger