DON'T CHUCK 'EM MICHAEL, I've solved it! I know where all that hideous clanking clonking noise is coming from on the FC3. I have had the shells off of my FC3's for sometime because, as you may know, I built lego around them. Therefore, I'm well acquinted with the mechanism. Having said that, until I'd had a purposeful look at them tonight, I had never really sought to cure the noises, I just put up with them! Now I know exactly where the problems lie, and how to cure them (I'm sure there are other solutions that work just as well also mind). It is midnight here in the UK so I shall nod off soon, but before I do, I'll describe where the problems were, what the problems were, and how I fixed them. It is simpler than you may think!
Problem 1 of 2 with the FC3;
At the point where the rear of the pedal lever attaches to the frame, there is metal moving against metal!!! Er? Self explanitory eh!
Problem 2 of 2;
At the point just before the pedal lever leaves the plastic casing, the is a guide system. Here, two rounded plastic lugs (part of a larger plastic attachment on the pedal lever) are used to butt or buffer against the metal frame. This is the worst offender!
In both above cases, Yamaha use gunk (lubrication) to compensate for the bad design. As we all know, IT DON'T WORK!
Solutions:
I had originally shimed some laminating plastic between the metal on metal, however, after doing the same with the plastic on metal, and testing the results by working both pedals on the floor, the shim in the metal on metal wasn't actually necessary! I removed it and under normal piano playing conditions, it didn't pose a problem.
The only thing that remains for me to do tomorrow is buy some petroleum jelly and lubricated the shim between the plastic and metal.
I will post a video tomorrow after final testing. I may also post some stills.
p.s. yippee!