Note how the bracelet is positioned: the Seiko logo on the clasp is "facing" the 6 o'clock position. Gently press the spring loaded bar in and pull the bracelet away. If necessary, push the bar form the other side too. Here is another shot of the spring loaded bar clasp Now detach the bracelet from the watch case by sliding down the spring loaded bar screwdriver size or 1 mm blade.
Note that this bar is slightly different than a clasp bar - it has two "shoulders". Place the screwdriver between the two shoulders as per photo, slide the bar while pushing the bracelet towards yourself, away from the case. NOTE: I am left handed, so you need to rotate the watch to suit you. Here is another shot of the bar, showing the position between the shoulders where you should place the screwdriver size Reassemble the bracelet and store the two end pieces and bars in a plastic bag.
To clean the bracelet use dishwashing liquid and tooth brush. If necessary, soak overnight first. Dry well with a hair dryer. Case back removal Place the watch in the case holder as per photo. Close the holder as high as you can for a firm grip.
The 3 arrows mark position on the case back where prongs of the case opener will be inserted. However make sure that the watch sits parallel and in level, not under angle. Use a rolling screw on the top to close the first 2 prongs and then rotate handle bar to bring the third prong.
Proper alignment is absolutely crucial! Take your time to adjust the tool so that both grip and alignment are correct. Here is another shot of the case opener showing correct alignment and grip. If your case opener comes with multiple attachments, use the finest, most pointy one. To open: put enough down pressure on the tool so it wont slip!
Turn the handle counter clock wise. Once the case back gets reasonably lose, remove the tool and unscrew it by hand. Important note: once again, it is absolutely crucial that the tool, case holder and the watch itself are properly aligned and parallel. In most cases the case back will open relatively easily.
However in the case of a divers watches, it is a good idea to clamp the case holder in with a large vice. By doing so, you will have both hands free to hold and press down the case opener. Water damaged cases are almost impossible to open by hand.
You may need a large bench case opener. More Chapter 3 Identifying the calibre, reference and serial numbers, and bracelet adjustment. Plus some frequently asked questions. More Chapter 4 Pulling a watch apart - and even putting it together - is not that difficult at all. What is challenging for many novice horologists is the deeper understanding of how a watch works, Or more precisely why it is constructed the way it is.
More Chapter 5 As we are getting closer to disassembly of the Seiko 7S26 watch mechanism, now is the perfect time to get familiar with a very basic concept of automatic or self-winding movement. More Chapter 8 Disassembly of the Seiko 7S26 Automatic Winding System - "The Pump" More Chapter 9 In this chapter we will continue with the disassembly of the Seiko 7S26's remaining units, starting with components in the power source unit, then the oscillator and then we will disassemble the counter or train wheels.
In addition, the last step is to pull apart remaining components in the time and calendar setting assembly. More Chapter 10 This chapters deals with disassembly of the mainspring barrel and mainspring cleaning and lubrication. Before you undertake disassembly of the mainspring barrel, there are a few things to note More Chapter 11 In this chapter, you will learn a couple of concepts related to components re-assembly. It also contains a few exercises to help build your confidence and skills to a level which will allow you to undertake more complex procedures later on.
More Chapter 12 Continuation of Chapter Assembly of train wheels and the escapement. More Chapter 13 In this chapter we will commence assembly of our Seiko 7S26 movement. More Chapter 14 Assembly of train wheels. Chapter 2: Tools.
For the list of recommended tools: tweezers, screwdrivers, hand removal tool, movement holder etc. In August , a group of watch enthusiasts started their journey into horology following an online tutorial. Chapter 2 Essential tools required for disassembling and assembling a watch.
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The Seiko caliber 7S26 is an automatic movement used in many popular Seiko divers and the entry level Seiko 5 watches. This movement was first released to. The 7S26 family was introduced in as a mainstream automatic watch movement, replacing the Seiko in many cases. Seiko 7S26 caliber is one of the automatic movements introduced in It is non-hacking and non-winding mechanism, with its accuracy ranging.