See the pictures:
I picked up a really nice Raleigh Grand prix yesterday that was plastered with little decals that say it was made by Carlton in Worksop, England. The rubber boots on the brake levers have Carlton on them as well.
As you can see in the picture, there is a little metal bonnet slider of some sort attached to the brake lever at the top where it enters the boot. It is hinged but does not move very much.
What is this ??? I am curious.
Any help appreciated.