We are a commune of inquiring, skeptical, politically centrist, capitalist, anglophile, traditionalist New England Yankee humans, humanoids, and animals with many interests beyond and above politics. Each of us has had a high-school education (or GED), but all had ADD so didn't pay attention very well, especially the dogs. Each one of us does "try my best to be just like I am," and none of us enjoys working for others, including for Maggie, from whom we receive neither a nickel nor a dime. Freedom from nags, cranks, government, do-gooders, control-freaks and idiots is all that we ask for.
We had dear old friends over for dinner last night. Somehow we got on the topic of music boxes and, guess what, I have a Regina with about 25 discs. A charming sound.
My Dad had given it to my Mom as a wedding gift. An antique at the time. It works just fine, but I am afraid to over-wind it. Given its age (c 1890) it is probably due its 100-year cleaning and oiling if I can find someone who can do it.
I bet if you could find a good clock repair guy he could handle it for you; they're used to mainsprings care and maintenance.
I've got a vietnamese clockmaker in the Dallas area that cares for my clocks; one of them belonged to my great-granddad, he kept it on his farm, and one of them I built with my daughter. This guy is great - in his late 70's, very quiet and unprepossessing, top notch work with no wasted motions. His daughter works with him in the shop and does the translating. He doesn't have any fingernails; the stories he must have in his head.
There's a good clock repair shop in London, who could provide the 100 year service for your music box. Just figure three hundred dollars each way for Fed Ex Overnight. And a couple of hundred for the cleaning. You do get the whole thing done for less than a grand. http://www.antiqueclockrepair.co.uk/
The Lightner Museum in Saint Augustine has a collection of working metal disk and mechanical "jukebox" players. I'm sure they could put you in contact with the preservation craftsmen who maintain their collection. Email: firstname.lastname@example.org