I had a light rattle from the front of my new bike. Had it built up by my bike fit guy and he is always spot on. Was fairly light and coming from the front and checked everything from cables tapping the frame, valves loose in wheel cut out, headset play back and forth, wheel tension, etc.
Turns out that there is a carbon spacer that sits inside the tube and goes around the headset where the headset cap screws in. I assume that it's to keep the shape if the tube or even to keep it all central once tightened. Headset itself was solid as expected. Tiny bit if carbon paste applied and now it's silent!
Amazing how many small pieces link together to create random noises. This time the sound was in the right area, but not the component itself as such. Good fun hunting though.
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