Well, I'm not a fan of the McLeod diaphram PPs, I think they are hit or miss, and even w ceramic I've heard folks having them slip at even moderate HP levels in the 400s.
Yeah, run it for a while, it may bed and the chatter go away, it's a good course of action.
I'm def curious how you make out, follow up if you can.
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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
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