You will find a lot of included push rod hardware on many ARF's is metric and undersized from US based hardware and where it is dangerous is when one uses a threaded metal clevis from a US supplier on an undersized metric rod. They can and will slip.

Much better in that situation to use self threading plastic clevis in that situation which will in most cases work ok on the undersized rods. The oft repeated advice to always replace plastic clevis with metal is frequently very bad advice.

John