So I used some plumbers Teflon tape to fix the rattle in the secondary roller on the 'bigsby'
The grommets were too small so had a lot of movement, hence the rattle/buzz. I applied the teflon to the grommets to make the grommets a larger gauge, and voila it's not rattling anymore
Now. I also found that the D string slot in the Knut was too deep also. So I have filled that with epoxy to recut (the A string slot has been fixed and is now all good)
So hopefully tomorrow I get a chance to cut the D slot and set up the guitar (action and intonation) then I shall be bringing some sweet, buzz free sound tests to your ears!