I had to ream them on my G4 also. After 5 flights, all balls had backed out on the servo arms and bell cranks, despite being degreased and (blue) threadlocked during the build. I've since used red threadlock and have replaced the bell cranks links with QuickUK links and threaded rods. Shame I can't do anything about the swash links :/
I don't have any spare larger ball links otherwise I would just rough it up and use that as a reamer.
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Harry
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