help paleez

[A Yerbury]

not too bright on all things electrical but I get the gist, ducati have just sent brush plate and brush bolt but they do not supply the internal insulating grommet (see pic) in theory I could blue peter one with some rubber and scalpel. Idea being to insulate bolt from motor casing yes?
thanks.
Alex
hmm could use a mouse mat, the only case of interaction between a computer and a carbed monster :D