Yep, that looks familiar

I had found an ebay seller in TX a couple of years ago that was selling NOS ones for pretty cheap ($20/ea), so I bought a couple of them. Last time I overhauled the Raleigh, the one I was using failed in just such a fashion, so I am down to 1 left.

I've owned this frame since new (1973 frame, bought in 1974). I would guess the one that last broke was maybe the 3rd one I had replaced? I guess there's always braze-ons...