I run my bike all year-but fortunately have never encountered this problem-defending Triumph, I would say, if only one other has experienced this ( I will check posts again) this is not a design issue...but if you were talking roter arms...then this would be something else!
Mal- where are you from- could not see your details in the profile- im assuming UK, possibly Hereford?( home of the SAS)

( need to know)