1 . Spiral waterproof watches . Case on its shell with the back cover are screw , relying on the role of threads so closely on the shell and the rear cover rotary joint . Watch glass is the tool into the rolling pressure , the more closely . Article handle on the back cover and the shell beforehand , as well as places where rotary joint placed waterproof gasket ( mostly with the production of butadiene-acrylonitrile rubber ), so the water can play a role . This waterproof watch case back cover has a notch out there , some polygonal bumps . Switch back cover to use the appropriate tool .
2 . Withholding of waterproof watches . Inside back cover of its high- convex bead ring , so that the case and the rear cover can be close to withhold them . Sheet glass and screw -type waterproof watches are also tools rolled into pressure , the more closely . Article handle on the upper shell and the back cover in advance and contact areas are also placed waterproof gasket . Open the back cover of this waterproof watch , a knife and pry , and also use rolling off the back cover with withheld or push lift a finger .
3 . Casing pressure waterproof watch . Case on its sleeve in the bottom covered with pressure . Watch the shape of the back cover of this case are special : the tube around a high wall , the movement mounted on the wall inside the back cover of the Circuit , watch cover glass directly mounted in the rear cover wall around the top , into the future on the shell casing pressure , Watch glass and back cover were driven and controlled to play the role of water-proof seal . The last section shafts connected by the upper and lower two , switch back cover , the first Article Abstract unloading on the first and the last section of the handle section shafts , with dedicated rolling and rolling with a press opening tight . No special rolling with fingers can press push .
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