Noisy Juki 563

[Farmfield]

So let's start off with me being pretty familiar with industrial sewing machine mechanics, but, and though the Singer 111 design is my absolute favorite, it's also a design I'm just not very good with, servicing... 

Now I got myself a noisy Juki 563. As far as I can tell the main issues are; a stuttery noise in the front, like the gears are too tight, and there's a "knobby" sound from the timing belt.

But the shape of the gears and the belt seems fine, so I'm guessing it's all a question of adjustment.

There's also a bit of a howl at faster speeds - something I've run across with several Juki 562/563's before - but never with Singer 111..? Anyone know why that is?

I'm kinda thinking it might be the rubber belt vs the cleated belt in the Singer 111's that might be a factor. Not cheap to get a NOS cleated belt, though, but if it's that, I might put up the $75 for one - especially to get away from that knobby sound. 

And I've checked around a bit and watched some videos, but I haven't found anything about these specific problems. So yeah, any tips, links to good Singer 111/Juki 56x service resources, videos, etc, on this stuff would be much appreciated.

Image for attention. Cheers. :D