spring around outside of drum

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Probably not needed. They were to help prevent "ringing" but I've seen many with/ without

As a guy who literally has turned thousands of rotors and drums in a previous life, I can tell ya all about ringing and chattering on a lathe.
 
Probably not needed. They were to help prevent "ringing" but I've seen many with/ without

As a guy who literally has turned thousands of rotors and drums in a previous life, I can tell ya all about ringing and chattering on a lathe.

Ah, that unmistakable tone where you know your cutting an album instead of a brake drum.:D

Yea, the spring is just a vibration damper that barely works in the first place.
 
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