Just been out and given it a thorough inspection.....yes a tight spot but I've seen worse. No damage to rollers or side plates.
What I did notice though is that my new tyres have a very slight line standing proud of the tread on the centre lines....looks like the marks from a mould process.....are they made like that?
It's possible that these lines are causing the vibes....very specific vibes...on acceleration between 25-30 mph.....then it's gone again.....
But also goes when I pull on the clutch lever and doesn't happen on deceleration...which suggests to me it's drive line related.....when the chains under stress.
Whatever, I'll live with it for now....it's got a 12 k service booked( cos I don't want to faff around checking valve clearances) at a trusted and competent Triumph shop ( Jack Lilleys).
They can have the unalloyed joy of changing the chain and sprockets at the same time...it's only money after all( sigh)