It is true that flaking center pin plating has been observed in some cases, but that certainly isn't the only cause of excessive flange friction. Don Mannino is our most knowledgeable expert on this topic. I hope you've had the opportunity to attend his class on the topic. I seem to recall he (or someone else) indicated one of them Asian manufacturers had friction problems because the action cloth got bound up while being pulled through the flange. The felt was excessively dense in places and the high friction developed over time.
When the folks at WNG developed their first generation of composite parts they were using felt bushings. They had big problems until they employed a former employee of one of the "big" action part manufacturers, and he revealed some "trade secrets" that helped them optimize their procedures. Of course, they then developed their hard composite budshings.
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Patrick Draine RPT
Billerica MA
(978) 663-9690
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