Flange Center Friction Increase

[Ron Nossaman]

>I am refurbishing a YC grand action. Hammer shank flange center friction 
>is all over the place, so I am repinning most centers. Some of the 
>low-friction centers have the following characteristics: First swing test 
>- 9+ swings, then each time I test the swings, the number of swings drops 
>by one. So after the ninth (or there abouts) swing test, I'm only getting 
>one swing.
>
>What is that all about? And ideas?
>
>Terry Farrell


It's the center pins. Try this. Find one that swings 6+ times and side 
stress it a bit as you manually push it through it's swing arc a couple of 
times. Then swing test it again. It will likely have seized up enough to 
not swing at all. The only remotely right way I know to fix it is to repin. 
I have, under duress, alcohol shrunk and lubricated a Yamaha action that 
was doing this, and as far as I know, the problem hasn't returned. Except 
that when I finished, ALL the hammers swung 9 times.


Ron N