Watch glass is an exterior part. It is the most prominent part of the watch and has the greatest chance of friction and impact with the outside world. Due to its material and location, the watch glass is one of the most vulnerable parts of the watch. Any watch glass that is lost, broken, or cracked must be replaced according to the original specifications. So how to change the watch mirror of a second-hand Longines watch?
1] How to change the watch glass of a second-hand Longines watch
When replacing the glass of a second-hand Longines watch , you can directly install the watch glass into the watch glass notch of the watch case by hand. The method is, after removing the damaged watch glass, clean the watch glass notch of the watch case, arrange a tight ring on the inner opening of the watch glass, and then install the watch glass into the watch case notch, making it a quarter of the watch glass. When the watch has entered the notch, use the four fingers of your left hand to support the back cover of the watch case. Press the center of the watch glass with your thumb, and push the edge of the watch glass that has not entered the recess of the case into the recess with your thumb. Squeeze until the surrounding base of the watch glass enters the case groove.
It is best to use cover pliers. Using rubber cover pliers can make the force on the watch glass uniform and press the edge of the watch glass into the groove of the watch case at one time. However, the inner and outer diameters of the watch glass must be selected accurately, otherwise the watch glass will be crushed. After stacking, try installing it by hand without tightening the ring. If it can be installed, it means the outer diameter is suitable. Then install the tight ring and press it into the table with amine cap pliers. The above operations require certain skills. If you are unfamiliar with the watch, try not to do it yourself. It will be much easier to send it to a professional maintenance agency.
2] What kind of watch mirror can I exchange for second-hand Longines
sapphire glass : The physical and chemical properties of this kind of watch mirror are very stable, and the hardness is very high. Second only to diamond , it can easily cope with scratches, wear and corrosion. But because the hardness is too high and the toughness is not good, it is very afraid of falling. However, many high-end watches will choose this kind of watch mirror!
Mineral glass : The watch mirror made of this material is characterized by its strong resistance to vertical strikes and excellent wear resistance. This kind of watch mirror is widely used in mid-range watches, and the watch mirror of general military watches will also use this high-hardness glass.
Synthetic glass: also called organic glass , and another name is "Alec glass". The hardness of the watch mirror made of this material is not very good, and scratches are more likely to occur. But its toughness is very good and not easy to break. The cost of synthetic glass is very low, and many low-end watches generally use this kind of watch mirror.
