For weeks.... No months there has been a scratch rattle on my bike that would come and go.
I thought it was mudguards, so repaired them and fettled them - no change.
Then I thought it was a nipple stuck in the wheel rim - swapped the wheel - no change.
Then I thought it was the rear guards, then a seat... No change
I was coming to the conclusion the frame was cracked or a rivnut had dropped off inside..
Then yesterday i went over a rough section of road that usually causes the rattle to rattle and there was a ping and no more rattle.
This is what I found.
Peace at last!