Or meant for external dampening? Or does it matter? Maybe I could pull the internals and use the factory external dampeners? 'Cause 4 out of the 12 I received have internal dampeners and the rest don't.
979 and 980's are made from different steels and the heat treatments are different. Spring rates are of course different. 979's are not internally dampend...980's are.
I agree with sending the whole batch back...at the supplier's expense to get a shipment that you have confidence in.