470mm C-Beam has different sides - Y-Axis Bearing Block not mountable on wrong orientation

[schoenid]

Describe the bug
The 470mm C-Beam has 2 sides, which are different:

• One side has 2 threaded holes
• The other side has 4 threaded holes

The side with 2 threaded holes has to be used for the Y-Axis Motor Mount.
The side with 4 threaded holes has to be used for the Y-Axis Bearing Block.

Document Name / Location
https://millenniummachines.github.io/docs/milo/manual/chapters/40_y_axis_assembly/#y-axis-motor-mount-and-bearing-block

Required Resolution
Please specify that the orientation of the C-Beam is important:

The side with 2 threaded holes has to be used for the Y-Axis Motor Mount.
The side with 4 threaded holes has to be used for the Y-Axis Bearing Block.

Additional context
If mounted in wrong orientation, the Y-Axis Bearing Block can't be mounted. The whole thing has to be unassembled and corrected or the two holes have to be threaded manually.

see also: https://www.youtube.com/watch?v=ptZ5Kw6fP-U at 2:01:00 ff

[benagricola]

We should potentially call this out as a note section, as this is specific to the LDO kit. With self-sourcing (which is what the build manual is targeting by default), you would either be buying the C-beams fully tapped, or completely untapped.