> Do any of you music lovers know how or where I can get the
> main spring of my Thorens repaired?

Wow -- that's a tough one.  I would start by addressing the following
people, but no promises:

1.  Nancy Fratti, of Panchronia Antiquities, deals with antique music
boxes, restoration and supplies.  I don't know how much she can help
with a Thorens box, but she'd be my number one start point.  Don't be
afraid to ask her if she knows where to get the spring if she can't
supply one for you.

  Nancy Fratti - Panchronia Antiquities
  P.O. Box 400, Canastota, NY 13032-0400 USA
  tel.: 315-684-9977   fax: 315-684-9976
  E-mail:  musicbox@dreamscape.com

2.  Find a music box store and try to get from them the name/number of
Thorens' distributor.

3.  Clock repair man.  For a very old music box the springs will never
match, but for the modern/newer ones they might be able to help you
out.

Now that you have the spring, what do you intend to do with it -- take
it to a clock repairman to install it for you, right?  Those barrels
are packed tight with a lot of pressure and you really need to be an
expert in order to deal with one.  Clock repair people and music box
restorers know how to do it and have the proper respect for the power
of the spring -- it is fully capable of taking out an eye if you don't
know what you're doing.

Good luck,

Eliyahu Shahar