Add a replacement flex coupler to an orbital lug

Push the lug into the nose bridge and align them with a rod (or round file) of 2mm diameter. Give it a wiggle to assure the alignment

Use a 2mm round file to align and smoothen the pairing. Don't grind it down: you still need a press-fit for the replacement pin to stay in. But you want to give it a good cleaning and you need perfect (!) alignment to successfully re-insert the new pin.

See step 11 for any mistakes you can make here, before proceeding to step 10.