Ah, this might save a new post....
having just finished restoring my frame and this bracket , I thought it would be a shame to just bolt it back on and scratch the frame up, as this was a very rusty area of the frame before I restored it , So I thought I would put a small wrap of something like thin inner tube or some other protective wrap around the frame first...but then I thought does this bracket have to be earthed at the frame
I am quite sure it doesn't but wanted to check...