Hot Rods Spalding Grand distributor down: cleaning rotor burns?

I'm fighting an a miss that I believe is caused by burn areas in my rotor assembly. Bubba (RIP) warned that sometimes too much voltage on early Spaldings can cause this. I may have picked up a unit that suffered this fate previously. I tried running this distributor a couple years ago, got frustrated and now back at it determined to make this work in my coupe. Owned two in my life and both ran flawless.

I follow Bubbas advice: Alkydigger condensers, heavy duty points, Blue Bosh 012 coils with no resistor, full disassembly and inspection of weights, then I set up on my Allen distributor machine to sync the unit, dwell at 60. Side caps are clean and crack free. I also removed one of the two plastic gaskets on each side to bring the contacts closer but same miss. back up distributor runs fine...this one I'm at a loss and blaming the burn marks.

So any tips to clean burn marks out of copper? I've tried a little vinegar and salt, scotchbright and polished. I havn't been able to get the marks fully out and after a few hours running the grey spots come back and a slight engine slight miss worsens. Maybe I need to polish it deeper? Any suggestions?

 

i have a roll of copper foil ,don't know what it was used for, from a radio shack yrs ago-you could adhere it to those slip rings and it would prob last yrs--maybe look at mc-carr...

 

I'd try a commutator/ slip ring cleaning stone. Used to use them quite often for this...in a past life.

 

i was thinking it was worn away rather than just a 'smudge' on the copper-...

 

I had no idea they made such things, will try.