Thank you. I used this case for a eta 2891-a9 movement. Hopefully i can put it in a proper case eventually.
Being the case is unknown, do I measure the bezel groove diameter or crystal diameter?
Seems odd that none of the first three repairers could intuit that if the crystal was shaped the correct gasket would be too. Instead they kept trying to use a round gasket, I suppose because they didn't have access to the genuine Omega gasket. But where did the unending supply of crystals come from?
I don't think you are supposed to use the 4266 on a crystal with a tension ring. You will likely damage the replacement crystal, and also not be able to install it successfully. The claws won't be able to reduce the diameter of the crystal due to the tension ring pushing against it.
You would need to press it out and in using a regular press.
Hi, thank you
I thought that might be an issue fitting the new crystal, but you seem to be saying I should remove the old crystal by using a press,
and fit the new one by using a press?
Would a basic press do it, or should it be a specific kind of press?
Cheers!
Yes, they press in, so they press out. Alternately, you can knock the crystal out, but you would need to protect it if you plan to use it again.
Would you use any of those methods on replacing the crystal on my D6672? The current crystal is 30mm and turns. I was going to order a 30.1mm and instal it but was curious as to the method. Here is my link from a prior post about the watch.
Ultra Thin D6672
Glad you are all finding these posts useful. 👍
Moving on, here is one that's been covered before, and is a bit unusual - a mineral crystal held in with an O-ring. These are found in the Mark II Speedmasters, Flightmaster designs and others like this also. The crystals have a groove cut around the circumference of them, and this is where the O-ring seats as you can see on this Flightmaster crystal:
Omega makes a tool for inserting these crystals, and here the tool is just past the crystal. The crystal has had the O-ring installed on it:
The inside of the tool is lubricated with Fomblin grease, and the crystal is inserted into the tool:
The tool is tapered on the inside, and as you press the crystal into it, the O-ring is compressed. There is a small groove on the inner diameter of the tool that acts as a stop - this leaves part of the crustal sticking out of the tool, to help locate the crystal in the case:
The tool and crystal are positioned on the case, making sure to align the tachymeter scale on this one:
You can start the insertion by pressing the crystal with your fingers, but I find using the press to finish it is best:
This is honestly a terrible system, and you have all likely seen a watch where this O-ring has turned to black goop, and has caused damage to parts under it.
I just purchased a Mark II that needs a crystal replace. Is that something that I can do myself as a beginner in the hobby or do I need special tools as you mentioned in your comment?
Thank you
You will likely break the crystal without using the installation tool…
Thank you. Found the part. It’s $40. I’ll order it.
I noticed the crystal on my Speedmaster MKII is loose. Is there a way to reseated or is that too risky?
How long since the last service?
Glad you are all finding these posts useful. 👍
Moving on, here is one that's been covered before, and is a bit unusual - a mineral crystal held in with an O-ring. These are found in the Mark II Speedmasters, Flightmaster designs and others like this also. The crystals have a groove cut around the circumference of them, and this is where the O-ring seats as you can see on this Flightmaster crystal:
Omega makes a tool for inserting these crystals, and here the tool is just past the crystal. The crystal has had the O-ring installed on it:
The inside of the tool is lubricated with Fomblin grease, and the crystal is inserted into the tool:
The tool is tapered on the inside, and as you press the crystal into it, the O-ring is compressed. There is a small groove on the inner diameter of the tool that acts as a stop - this leaves part of the crustal sticking out of the tool, to help locate the crystal in the case:
The tool and crystal are positioned on the case, making sure to align the tachymeter scale on this one:
You can start the insertion by pressing the crystal with your fingers, but I find using the press to finish it is best:
This is honestly a terrible system, and you have all likely seen a watch where this O-ring has turned to black goop, and has caused damage to parts under it.
