kieninger obergfell clock repair?

I have a kieninger clock, anniversary style except that it is not in a glass dome, but rather a 4 sided cover. Probably the only difference. I would say it was probably made in the 1970's. The wire or spring that goes into the top of the 4 ball pendulum has either pulled out or broke off. I don't see anything at the top of the pendullum that would indicate that it broke off. how do I get the spring back in. I can't seem to find a clock repair person in my area. thank you.