My apologies for a cut-n-paste jo, but I believe this will help:

"This usually happens when the clock is laid down on its back and then later put back upright and attempted to run again.

Understand these two points first before proceeding:
Some clocks do not like it when the minute hand is turned counter clockwise, so for the beginners, just go by the rule that all clocks should only go clockwise with the minute hand and you will be safe. In fact most clocks you can go backwards just fine, they are designed like this so it is okay, but to be safe for the sake of the few that can not go backward, go forward only.

Also, on just about all clocks, with the exception being newer Japanese clocks and 31 day clocks, the hour hand is only a friction fit and can be turned on the hour tube to any position on the dial, backward or forward. If the hour hand becomes loose during this, just push back on its tube and it will be tight again.

Now that you understand those two points, to move the minute hand forward only and the hour hand is usually only pressed on being a friction fit, we can continue setting the clock chime.

To correct a mantle or wall clock that is bonging the hour when the minute hand gets to 6 O'clock instead of 12 O'clock, just count the bongs, take off the minute hand and reinstall it on the clock pointing to 12 O'clock, then turn the hour hand to the hour you heard the clock bong and its done. To correct a clock that is bonging the wrong hour on the hour, just turn the hour hand to the correct hour the clock bonged, then reset the time correctly with the minute hand letting it bong as you go."

Also, here's the address for the DUFA Clockmakers in Germany:

DUFA Deutsche Uhrenfabrik GmbH & Co. KG.
Siederstr. 47-49
Germany
Tel: 772039901
Source(s):
http://www.clockworks.com/cintro3.html#4

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