After my C17 suffered a broken axle on the way to the 2017 Annual Meet in the Twin Cities, Airflow experts like Ray Jackson recommended I order some more replacement axles from Strange Engineering and install them. Thirty-three other ACA members joined in a group order. Here's an email I sent out about my experience in installing them. Some others had finished the job before I got around to it! In the email, I forwarded a detailed set-by-step instruction article written by John Spinks. The resolution isn't great on this copy, but it's readable.