I have a Kern anniversary clock, it runs 45 minutes and stops (it is consistently 45 minutes, must have restarted it 30 times by now. The main spring is either fully wound or it is frozen, cannot get it to move with the key. Everything else seems to be functioning normally. I live in North Central Kansas, cannot find anyone reasonably close that works on clocks, and I have several of them. So I decided to take a crack at learning to fix them my self. Can't be much more difficult than turbine engines can they? Any suggestions on a starter tool kit would be appreciated. My main interest would be 400 day and wall and mantle clocks although cuckoos fascinate me as well.