The RED AXS front derailleur requires the RED AXS setup tool to ensure a quick and precise setup. This setup tool aligns the front derailleur and holds it in place as you torque it into position.
Detailed instructions on how to install a RED AXS front derailleur can be found in the RED AXS user manual: Front derailleur installation.
Below are the part numbers for the tool that you will need depending on the size of your chainrings:
RED AXS front derailleur set up tool 46T-50T: 00.7618.179.000
RED AXS front derailleur set up tool 52T-56T: 00.7618.181.000