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Cheap crystal press on an Omega tension ring crystal?


DanB

Question

I was able to remove the crystal from my Omega Cosmic single-piece case using the recommended air injection method with a hypodermic syringe that Mark demonstrated on his video. It took quite a bit of pressure but it eventually popped off. I'm ready to reinstall the crystal but the crystal press I have is of the inexpensive variety in which the dies are either flat or, if they concave the walls are straight, not tapered. Will I ruin this crystal if I use one of the straight walled dies to press it in? My fear is that the pressure will be concentrated on the middle 4/5 of the crystal and not spread to its edges where the crystal is strongest. Any tips on how to do this with this inexpensive press will be appreciated - I'd hate to invest in an expensive press at this time.

Thanks!

 

 

Crystal press 2.jpg

Crystal press 1.jpg

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I have heard from members on here that these cheap crystal press tools do not line up well. So just be careful as the pressure needs to be even all around. I don’t think it will make much difference which type you use, a concave which has the walls of the die if it’s a good fit should keep it even. It shouldn’t need much pressure providing it is the correct glass. Just be careful.

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2 minutes ago, manodeoro said:

For a tension ring crystal you'd better use such a tool.
https://uploads.tapatalk-cdn.com/20200917/4217f9391c92f1a7276df0df33b58a55.jpg
 

That should not be used for tension ring glasses. That tool is extremely good for high dome but it squeezes the glass and with a tension ring inside it cannot work correctly, it can mark the glass and distort the tension ring.   

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The cheap die will mark the center of the crystal. The brass insert slides out of the die and makes a circular scratch right in the center of the crystal. 

Ask me how I know...

I’ve not dealt with a tension ring crystal so I don’t have further advice. 

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5 minutes ago, Tudor said:

The cheap die will mark the center of the crystal. The brass insert slides out of the die and makes a circular scratch right in the center of the crystal. 

Ask me how I know...

I’ve not dealt with a tension ring crystal so I don’t have further advice. 

Agree.

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49 minutes ago, DanB said:

Thanks everyone for the advice. I will order a press that has tapered dies for sure, and I think I just found one from a reputable company that's not too expensive (cheaper than a new Omega replacement crystal for sure). 

If you care to post the link we could advise you. Don't want you parting with you cash on something that might not be right. 

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It's from Esslinger:

https://www.esslinger.com/deluxe-watch-tool-crystal-press-and-case-back-press-with-24-nylon-dies/

It has a big selection of dies and should include a tapered one that will fit the Omega crystal. I've read these less expensive presses do not apply even pressure due to the two dies not being perfectly parallel (as Old Hippy also noted). I thinking I'll manage this by applying only moderate pressure initially, rotate the watch a bit, apply pressure again, do this repeatedly, rather than just go in all guns and try to install it in one shot. It was good to read that Rodabod had success with a cheap press and the same reference

I have seen that Horotec offers a press that's not as expensive as a Bergeon, but with dies and such it will still run between $150 and $200. 

Any other product suggestions or comments on how I'm thinking of using the press?

Thanks

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