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PeterGe

Blow out a saphire crystal?

Question

Hi guys,

 

I' got a watch here which is clearly a front loader. The back screws off but the movement ring is machined into the case itself. Also the opening of the caseback is to small to fit the dial through.
There also isn't any seam or gap in the case to remove the bezel,  besides the back lid, it is a solid case.

In this situation I usually use a pump to blow the crystal out after removing the stem. However, until now all the front loaders I've dealt with had acrylic crystal. This one however has a sapphire crystal.
My only concern is that the crystal could break under the pressure.

pictures attached.

Did anyone came across something similar?

 

ro-002-002.jpg

CCS390A-RS5-0013-Automatic-Back-PX-Edit-Download_4bc5ad91-14c0-4663-8adb-b3eef1725a37.jpg

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2 hours ago, PeterGe said:

My only concern is that the crystal could break under the pressure.

It will not break. Sapphire weak point is with impacts, not distributed pressure.

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On 14-11-2017 at 5:10 PM, clockboy said:

Is it possible to use a lift tool such as below:

5a0b1556c3a90_ScreenShot2017-11-14at16_09_21.png.9a6bc04fcf84c1924fffbc7b552a3d51.png

These tools are meant for acrylic crystal, not mineral or sapphire.

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On 14-11-2017 at 6:50 PM, jdm said:

It will not break. Sapphire weak point is with impacts, not distributed pressure.

True.

I'll give it go try this evening, worst case I'll need to replace the crystal ;-)

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