Michael,  Yes, I'm inclined to give you the advice you mentioned.
However, it won't necessarily cost you several thousand dollars.

Second, where are you located?  Can you take some pictures of the
problem?

Third, don't try to wind it up.  If it has a problem with the
governor, you are likely to do further damage (which could easily
cost you several thousand dollars).

Forth, the spring motor in a Regina #35 is _very_ strong and it
could easily clip off a couple of your fingers (or more) if you make
a mistake.  Let me take this a step further.  I don't know what your
past experience with music boxes, clocks or other mechanical devices
is but it sounds like you have not done this sort of thing before.
And I notice that this is your first post to MMD -- a smart move
before getting in over your head.

Fifth, if there are stripped teeth (especially on the large gear),
you can be sure that there was a major problem.  Are you in a position
to replace the broken teeth?  If not, you'll never be able to restore
that music box.

Sixth, if you try to take the spring out of the large barrel, you are
fairly likely to suffer a serious and possibly disabling injury.  If
you're really unlucky, you could possibly lose an eye, some teeth or
even your life.

Lastly, I'm not in the business of restoring music boxes but I have
restored quite a few over the last couple decades for myself and a few
others.  And I have removed and replaced a couple dozen music box
springs over the years.  But I'll tell you this, it will be a cold day
in hell when I try to remove the spring from the barrel of a #35 Regina
changer!

Here's what I'd suggest.  I'll send you my phone number in another
private e-mail.  Give me a call at your convenience and perhaps I can
give you some help and/or advice when I know a little more about your
past experience with this sort of project.

Regards,
Craig Smith
near Rochester, New York