Miyota 3510/3S10 stem removal

[Bill3145]

Hello. Can you help me please.

I have a Rotary  watch and the chronograph stopped workikng after a battery change some 8 years ago. I thought I would try to rectify this.   I am able to purchase another working model and want to change the movement into my original case.   I am new to this technology and do not want to damage anything by being heavy handed.  I have attached photos.  If someone could put a  ring around what I have to press or advise me of how to instigate the removal of the stem I would be grateful. Thanks Bill

[RichardHarris123]

look near the stem, it says push and an arrow.

[AndyGSi]

You should see a little dimple in the hole highlighted by @RichardHarris123 but this could be with the stem either in or out.

Edit

Just realised there's 2 stems.

Double Edit

Not sure what your intentions are with the old movement but may know someone that would have use of it @Zonablazer

 

Edited March 6 by AndyGSi

[Zonablazer]

1 hour ago, AndyGSi said:

You should see a little dimple in the hole highlighted by @RichardHarris123 but this could be with the stem either in or out.

Edit

Just realised there's 2 stems.

Double Edit

Not sure what your intentions are with the old movement but may know someone that would have use of it @Zonablazer

 

Andy you are the best! Yes I could absolutely make use of some parts if you are not planning on keeping it Bill.

[Bill3145]

Thanks for the information.   I have identified the place indicated  but I cannot get the crown to move.  When I put the tweezers into the hole do I have to oress down? I have done this but did not want to press too hard, or is there a knack by pushing sideways? As I am new to this, I was pleased to get this far without breaking anything but now seem to have come to a dead stop. Any advice would be appreciated. Thanks.

[watchweasol]

Hi this is the same movement as used in the citizen 35XX series should be of some help.

3974_3510.pdf

Section 5 on the sheet shows you how to remove both stems, there is a wealth of other information well worth reading.  Cheers

[AndyGSi]

51 minutes ago, Bill3145 said:

Thanks for the information.   I have identified the place indicated  but I cannot get the crown to move.  When I put the tweezers into the hole do I have to oress down? I have done this but did not want to press too hard, or is there a knack by pushing sideways? As I am new to this, I was pleased to get this far without breaking anything but now seem to have come to a dead stop. Any advice would be appreciated. Thanks.

Firstly you need to look in the holes and see at what position of the crown there's a dimple to press.

You then press firmly with a point (single tip from tweezers should work), then pull the crown when released.

[Bill3145]

Thank you so much for your time and advice.   I have managed to partially remove the stem and put it  back.  I had to use a small digital microscope to see what was happening in the hole and saw the brass type dimple.   I am now awaiting the other watch to be delivered and complete the change over.

Thank you once again

Bill

[Zonablazer]

On 3/7/2025 at 12:03 PM, Bill3145 said:

Thank you so much for your time and advice.   I have managed to partially remove the stem and put it  back.  I had to use a small digital microscope to see what was happening in the hole and saw the brass type dimple.   I am now awaiting the other watch to be delivered and complete the change over.

Thank you once again

Bill

Bill, what are your plans for the old movement?