[RodB]

I did a 514 awhile back. The paint was durable. It had been stored in a garage for many years and was thick with crud with rust. I used several cleaners and the one that worked best was gojo. After the cleaning I buffed with a very light oil to slow the rust. On the speaker, I had an RCA 100 which looks similar. The front and rear sections rotated about a half inch and I could pull them off. I posted photos of the finished restoration and you might be able to find them.