This is an extension of part 1) How to change hands & dial on a Vostok 24xx (How to change hands & dial on a Vostok 24xx
) and you need to read that tutorial in order to perform the date-wheel change.
Obviously, one has to remove the hands and dial, as described in part 1) in order to change the date-wheel.
- The date-jumper spring is one of the Vostok 24xx movement most notorious springs. One little mistake or a wrong move and it flies away. Make sure that your desk and floors are clean, because once the spring has flown, you have a very small chance of finding it back. Also these spring aren't easy available. Prevention is the key !!
- Use the proper size screw-drivers, tweezers and sharpened peg-wood. Clean fingers or use finger-cots.
With the movement secured, start undoing the 3x date-indicator guard screws in sequence 1, 2 and 3. By doing it this way, the date-jumper spring is allowed to release its tension underneath the guard, without flying away.
Best is the remove & store safely each tiny screw directly after unscrewing.
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Lift the date-indicator guard, keeping an eye on the whereabouts of the date-jumper spring. Remove the date-jumper spring (in the picture wrongly called the click-spring) with great respect and place it somewhere save. Note that the spring has a longer and a shorter leg.
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Turn the date-jumper (in the picture wrongly called "the click") slightly up, so it is out of the way when handling the date-wheel.
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Remove the old date-wheel.
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Place the new date wheel, concentric so the date-wheel outer-edge sits nicely flush with the outer-edge of the movement.
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Replace the date-indicator guard. This time the screw-sequence doesn't matter. What does matter is that the date-wheel is free to rotate when placing the guard and tightening the screws. Once the guard is back on, check free rotation of the date-wheel and push the date-jumper, through the hole, back down again.
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Now comes the most tricky part of the whole operation. Carefully place the date-jumper spring on top of the guard, long leg on the bottom, short leg on top.
Very carefully (take your time) push the spring in the direction of the arrow and make sure that the long end f the spring drops in the hole of the guard.
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Slowly continue until the bend of the spring slides over the edge of the guard hole, as shown in Picture #8 with the arrow.
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Place your right hand index-finger over the edge of the hole, preventing the spring from jumping out. Manipulate with a piece of peg-wood the short leg of the spring down until it drops in the hole and underneath the guard. Make 100% sure that the short leg of the spring is well secured underneath the guard before you release your right hand index finger. Failure to do so and the spring will orbit ....
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Everything is back in place. Check the date-wheel for rotation and observe the working of the date-jumper by changing the date via the time-setting mechanism (i.e. the crown)
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Now you can install the dial and hands as described in part 1).
Lots of Suc6 !