This is the final update on the Rheingold beer sign project (originally covered here: A beer light to guide us).
Rather than do anything drastic, I opted to retrofit the sign with LEDs and call it a day. A new cord with a polarized plug was also fitted and all the sockets were wired properly. There was a fair bit of corrosion under some of the original wire nuts, so I’m glad to have nice, clean connections now. That also serves as a reminder to inspect the connections on these old signs.
There’s a photo of the finished job below. I left a note on the inside for the curious person that pops this open in the future. Maybe they’ll decide to restore this sign to its original glory. Until then, I’m enjoying the warm, constant glow.

Nicely done.
Thanks! And thanks for the advice. It’s nice when a pro doesn’t totally disagree with what you’re thinking about doing.