This is an occasional problem usually associated with moving home and the clock getting knocked.
Mondaine produce a high quality product at quite a reasonable price, but the engineering and design challenge in replicating the look of the actual station clock has presented some problems for Mondaine. The second hand has, as you know, a large spot on the end which replicates the signal used by guards or conductors on the trains to let the driver know that it is safe and ready to move off. Excellent so far! However, this spot puts a strain on the pivot at the motor and makes the second hand unbalanced. To rectify this, Mondaine has put a counter-balancing weight on the opposite end. This is a very fine balance which can be upset if the clock receives a knock. Your first port of call is the Mondaine Service Centre which will rectify the issue (see where can I get my watch serviced above). Alternatively, use a local clock maker who could do the job for you. If you wish to carry this out yourself, it can be done.
The remedy is easy, but needs careful attention. You will need:
- a soft cloth on which to rest the clock face down
- a small to medium cross-head screwdriver
- a very small cross-head screwdriver
- a very sharp bladed knife or Stanley blade
- a small pair of square end pliers
- Place the clock face down on the cloth
- Remove the battery (ies)
- Remove the four large screws and take off the back of the clock
- (Large clock only) Remove the power input at 6.00 position. Gently use the pliers to to unscrew the outer ring and push the socket clear of the clock.
- At each stanchion around the clock on which the back sits, there is a screw. Additionally there are screws between the stanchions. Remove these also.
- Withdraw the whole back of the clock from the frame.
- (Small clock) there is a “sellotape” seal joining the clock and the glass. Slide the sharp knife around the join to split the glass and the clock.
- (Large clock) As above, but there is a synthetic rubber seal around the glass which needs to remain on the rim. If it comes off, it is difficult to put back, but it is not the end of the world if you cannot get it back on; the clock can still function.
- Carefully turn the clock over. If the second hand has become bent or unbalanced gently press the centre to ensure that it is fully home. If it is bent, try to spot at which point it becomes distorted and use this point as a fulcrum with your finger and bend the second hand up or down depending on what has happened. DO NOT bend the whole second hand as this will put a strain on the pivot mechanism and you risk distorting it and making matters worse.
- Replace the glass in the frame and replace the back carefully aligning the screw holes holes.
- Reverse the above steps.