Try the Protek, I cannot hurt and could help.
If the Protek does not work repin the whole set of hammer flanges and carefully
check the damper pinning as well.
Useing a brass suade brush clean the knuckles then spray them and the wippen
tops with "Glide All' teflon dry lube.
Polish the key pins with "Flitz" metal polish and spray them with the above
lube and spray the key bushings also. This will eliminate any friction from
the key pins except for key easing which should be done next.
Check the condition of the rocker felt and capstan tops for burrs.
Check and lube wippen centers, all of them.
When repinning use the polished center pins from Schaff (Yamaha).
If you can find a suitable helper to unscrew and screw on the shanks while you
do the repinning the job should be done in less than three hours by doing first
odd then even numbers hammer spacing is reduced.
If the hammers are worn then replace the set of shanks and hammers. Yamaha Cs
hammers may work and theyh are already glued togather.
Happy pinning.
Newton
nhunt@rci.rutgers.edu
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