47 V8 ignition mystery

[Brian]

I don't know if this has any relevance, and I only heard about it through a mate, an old friend, very clued up with flatheads, I respect anything he says, so take it for what it's worth.... His experience was with a new adapter plate for early distributor, the top mounted plate that replaces the original coil. He told me the centre carbon brush was made of plastic!! I know there's a lot of shonky repop parts out there, Craig, is your centre contact in your cap actually carbon?

[Old Henry]

Originally Posted by Brian

Craig, is your centre contact in your cap actually carbon?

The center contact has the appearance of brass around the edge with a black domed insert that has the appearance of carbon. See photo. There is no resistance from the wire end to that brass part but 30 ohms resistance at the "carbon" center.

Does it matter? I hate to just "try the new cap" because it is such a chore to do so - reinstall the whole wire loom plus the generator and fan. I'd really rather get a definitive knowledgeable answer to whether that resistance in the "carbon" center matters.