Getting off CW Twelve caseback

I often regulate my own watches, and with this new Twelve running at +11/sec, it’s a bit beyond my standards for a new Sellita. However, I haven’t encountered this particular type of caseback bolt before, and the CW page doesn’t really say anything specific about them. The small Allen wrenches I had on hand didn’t quite fit. Does anyone happen to know what I can use to unscrew these? I’ve asked CW but figured I could tap into the WC hive mind :)

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Best of luck finding out.

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First make sure they arent cosmetic screws, i doubt it tho.. it could be a screw on caseback, ive had tons of vintage watches with 12 sided screw casebacks. You could try buying a cheap bulk arrangement of allen wrenches and file down the closest one

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Heretic

First make sure they arent cosmetic screws, i doubt it tho.. it could be a screw on caseback, ive had tons of vintage watches with 12 sided screw casebacks. You could try buying a cheap bulk arrangement of allen wrenches and file down the closest one

How do you open the 12 sided ones? I really need to find this out.

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Some technician screws have a range of hex screws, maybe look for a set?

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My guess is 2.5 hex key. Otherwise it’ll be a smaller, custom key assuming they are not cosmetic as noted above.

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Heretic

First make sure they arent cosmetic screws, i doubt it tho.. it could be a screw on caseback, ive had tons of vintage watches with 12 sided screw casebacks. You could try buying a cheap bulk arrangement of allen wrenches and file down the closest one

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The marketing copy definitely makes it sound like the screws are functional

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JaimeMadeira

How do you open the 12 sided ones? I really need to find this out.

The vintage 12 sides screw on ones you just open with a caseback wrench.

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Professor_F

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The marketing copy definitely makes it sound like the screws are functional

They look functional aswell.

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If it's under warranty you could return it for regulating rather than void it....

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Heretic

The vintage 12 sides screw on ones you just open with a caseback wrench.

I can never get mine to fit and turn without skating everywhere, scratching stuff. Even with plastic, it just won’t stay gripped in place. Very very shallow back mind you. Two to four millimetres at best. (Dads watch in need of repair)

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Is it a chronometer? Is it within spec for the movement?

It's new so inquire about warranty service. If not covered then live with it for a couple years. Seems foolish to void a warranty for a new watch over a couple seconds.

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Allen wrenches come in either metric or standard. They do not interchange and some have a tiny post inside to mess with the tinkering crowd. Dremel grind one to fit.

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foghorn

Is it a chronometer? Is it within spec for the movement?

It's new so inquire about warranty service. If not covered then live with it for a couple years. Seems foolish to void a warranty for a new watch over a couple seconds.

The tolerance for this particular variant is +/-20 seconds a day from CW spec sheet for this model. So it is still within specs.

But being a movement that you know can perform much better, a regulation can make it more accurate. True about the warranty though.

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nightfury95

The tolerance for this particular variant is +/-20 seconds a day from CW spec sheet for this model. So it is still within specs.

But being a movement that you know can perform much better, a regulation can make it more accurate. True about the warranty though.

Yeah I know that it's within spec and it really isn't running horribly but I'm a bit neurotic about these things. I guess the point about the warranty does make a lot of sense though... it's just going to annoy me to think that I could get it running within COSC if I could just go in and tinker a bit.

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How on earth did you get one so quickly!?