Now that I've finished tinkering on the rear beam, I'm about to sacrifice a spare Fuego Clutch pivot and stem and get it machined to take 2 roller bearings instead of the plastic bush (of which one half has disintegrated).
The bearings I am using are commonly referred to as a '608' bearing that are used on skateboards and tumble dryers (amongst 1 million other things).
I'm hoping it makes the clutch a little lighter and removes that slightly weird binding feel that my Fuego sometimes gets.
I'll post some photos when done if it works ok.
I'll speak to the engineer about the possibility of putting a grease nipple between the two bearings also.