OS: Windows 10 (10.0)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.20729 (Git)
Python version: 3.6.8
This video shows one way to center a hole in a slot. The basic process is:
1. Open the Sketcher workbench.
2. Draw a sketch on the slot to anchor the hole to.
3. Go back to A2plus and constrain the sketch to the slot.
4. Then constrain the hole to the sketch.
Please post why this wouldn't work.
Please post better ideas.
Hope this helps.