1570 screw

[basketbob951]

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[freddy333]

(click pic for link)

[automatico]

This is common knowledge but it might help...

 

Some rolex cases and aftmkt cases use screws with flat top shoulders and some use angled shoulders. If the movement in a watch with flat top screws will not turn in the case (with the screws turned all the way down), try angled head screws.

 

Most genuine and many aftmkt cases are made with a cutout at 9 o'clock so the movement can be put into the case with both case screws installed (screwed all the way down)...one screw goes down into the case where the case tube is and the opposite screw goes down into the case where the cutout is at 9. After the movement is seated, it should turn in the case to the correct position for the stem to line up.

If there is no cutout at 9, you will have to either install the screws at the case tube cutout one at a time or have one screw in the movement and allow this screw to go past the case tube cutout, then turn the movement around and install the other screw.

 

If the movement will not turn or is very hard to turn in the case...determine if it is the case screws that are the trouble...sometimes they will bind in the groove in the case, maybe because you are using flat top screws where angle head screws are needed (angle heads are thinner). If you force the movement to turn inside the case it might rub paint off the dial or break the dial feet.

Every time you turn the movement/dial in the case you are slightly scuffing the dial so check for dust, lint etc before you turn the movement.

 

Make sure the dial is seated on the movement before tightening the dial screws down because if there is space between the dial and movement it might make a dimple in the dial when the case screws are tightened, forcing the dial down against the movement.

 

Make sure there are enough threads on the case screws to allow the screws to back out against the groove in the case without running out of threads...this may strip the top thread on the movement or allow the screw to come loose between the movement and case and wedge the movement in place.

Make sure the dial screws are not too long or they might bend the dial etc when screwed all the way down.

 

On aftmkt cases, make sure there is ample clearance between the winding rotor and caseback after casing the movement. You can put a thin piece of Rodico on top of the center of the rotor and screw the caseback down, then remove it to see how thick the Rodico is. You can check clearance at the edge of the rotor the same way but the Rodico has to be very thin so there is no undue pressure on the outer edge of the rotor.

You can also put a thin piece of paper etc between the outer edge of the rotor and the mvt plate to keep the rotor from tilting over. The trouble with this is if there is not enough room between the caseback and rotor...it may force the rotor to turn and shred the paper etc or push it into the balance assembly.

 

I have seen more than one watch that would not run after installing the movement because the ss hand was too long and rubbed the outer edge of the case or it rubbed the underside of the crystal.

Turn the case screws down against the movement and it runs...back the case screws out to hold the movement in place and it stops. Wtf??

You never know what's next.