On 12 September 2012, Steve Gyles in Church Crookham, Hants, England, wrote:
I have just taken the metal spring plate out of the rotor.

"The plastic behind it was soft and burnt. Looks like it has been shorting through the rivet.

Thought you might like to see the evidence of arcing I found inside the rotor".

"I extracted the arm and rivet and found firm evidence of arcing on the rivet (ignore the bright silver marks on the arm. That is where I levered it out).


"I cut the rotor in half. The distance from the rivet to the spring retaining plate is 4mm. So, the electricity penetrated this distance of plastic. Seems a lot.