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The two small circles you see on the top is the end of the threads from the two screws on the underside holding it in place.
If you turn the arm around when it is off you will see the screwheads.

Edited by HSL
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You have to demount the balance wheel/hairspring/stud from the cock.  Turn the balance cock over and you will find two TINY screws that you remove to free the jewel setting and the end stone.  The regulator arm usually simply snaps onto the setting above the cock.  BE CAREFUL and DO NOT BEND the regulator pins and don't lose the screws.  Can be a tough job for someone just starting out (not that you are), but you have to learn sometime.

 

BTW, this is not a shock setting for the balance cock.  The setting is rigidly fixed and not shock protected.

 

Good Luck,


RMD

Edited by rduckwor
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Mark shows you how to remove the jewel setting in this video: The first part of the video shows the screw heads on the underside of the balance cock. In your case you will only have to clean and oil the jewel and not fit a new jewel like the rest of the video shows. 

 

Edited by JohnHutchins
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Agree with all above. If you decide to remove the endstone assembly, soak in naphta for a day or use penetrating oil on the screws, leave oil to soak-in over night. Sharpen a screwdriver to perfect fit, place the cock on a hard flat surface, press rather hard on the screwdriver, if it dosn,t unscrew easy, soak more.

These little screws get stripped easy.

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This subject has previously been covered, Endsrones limit the staffs axial play thence all else including very important impulse jewel stays within bound, further pivot rests on endstone instead of pivot shoulder.

You can remove endstones to clean, peg and oil.

Put some penetrating oil on the two little screws, let sink in over night, unscrew the next day.

Regards joe

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