Ignition buzz in BT headset

I've now done a better job of the foil idea.

I rode out today with the partial baking foil in place and it was apparent that the buzz was still there. This evening I completely stripped out the wiring, mic and speakers from my helmet and wrapped the mylar(??) based foil from the aforementioned post around the three wires coming from the plug. I took the bike for a short ride up the road and I think it's cured the issue.
The picture is of the Satellite Cable parts. I stripped the black sheathing, the copper braid and the mylar foil from the foam/copper core. I recycled the copper and took the foil 'tube' and flattened it out. My first attempt was to use it as a tube but it was a pig to keep in place despite a bit of tape to hold it. Flattening it and helically wrapping it was easier but you will need to use more.
(Image is the parts of the coax, the foil in tape form is in front.)
I used the coax because I had a load handy, there is adhesive foil tape also available which I imagine would work too. I'll keep you all posted after a long term test.
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