Hello to all! I hope someone can help me with this incredibly annoying problem: 
the speed indicator mech of one of my Credenza X's chatters at 78rpm It's fine 
at 80, it's fine at 90 (I have a Hughes adapter I use for Pathé verticals), and 
it's fine below 77. But right at 78 to 79rpm, it chatters. 

It's pretty obviously the contact point between the leather nib and the 
governor disc -- once it's up to speed, it bounces instead of riding smoothly 
against the surface. I've cleaned the disc and even held some 2400 sandpaper 
against it, I've replaced the leather nib with fresh leather shoestring of two 
different gauges (one which was sold specifically as material for phonograph 
brakes), I've soaked the nibs in oil, I've slathered them with lithium grease… 
Nothing helps. I can get a few plays without chatter if I apply more grease, or 
clean off the grease that's there (same result -- "disturbing" that contact 
point in either way helps for a few plays). 

Anyone else ever had to deal with this? 

Thanks in advance,

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