They are rubber washers/bushings there to absorb some of the vibration.I noticed mine when pushing bike into garage after maybe 20,000 miles.I had them repaced at Triumphs wallet but have began to loosen again at 35,000...they are torqued down and seem to be a design delema of the R3T..now Flips' idea of a poly-type bushing/washer may be the answer to a longer lasting solution..I may try this at 36,000 mile service in the spring and will report any progress...only takes a few minutes to check torque and have a clear mind!!Or,perhaps my solution would be to ride it into the garage and perhaps would never have had noticed the movement.!