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QUOTE what evidence do you have for the above hypothesis?

I can't speak for Jim, but my experience is that some older code 100 Peco which I have always cleaned with a Peco rubber seems to need cleaning a lot more often than more recent code 75 which has only been cleaned with a CMX clean machine and liquid. My understanding is that the Peco rubber which is particularly abrasive leaves microscopic scratches which slowly oxidise and since they don't present a flat face which can be cleaned in the next pass, remain oxidised and non-conducting.

So I'm inclined to go along with Jim on this one.

David
 
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