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Old 16 May 2008, 12:40 PM   #1
MrClean
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removing a tudor crown

picked up another 50s tudor with a FEF (FHF) 390 movement - curious on removing the crown. From what i've gleened reading various threads, there's usually a screw that controls a pawl that i assume is riding or seated in a detent groove on the crown stem, that keeps the crown from pulling out.

i've got decent mechanical background, but absolute no watch experience and all i'm looking to do is pull the crown so i can remove the movement and then the dial and check the 7928 dials i've got to confirm they are 7928 dials, ie that the feet are in the correct position, before i send one out for repainting or restoration.

i've identified two screws i "assume" would be one of the two screws - #1 sits offset above the stem approx 2.5 - 2.75MM, the other, #2 slightly offset below the stem maybe 1.5 -2MM.

figured while i'm waiting for the correct screwdrivers to come in, i'd see what folks here, with more experience might say or suggest.

tks in advance

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Old 16 May 2008, 09:12 PM   #2
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Phew! That's technical!

Personally, if in doubt, I for my part would not do it myself, but let an independent RSC fix it (for instance "RSC" San Francisco) or a high-quality watchmaker like Bob Ridley.

But maybe "ABS" Mireyna or Ironstark can tell you how to go about this.
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Old 17 May 2008, 12:53 AM   #3
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I'm not familiar with that movement but judging from the photo, the screw labeled #1 simply looks like its another screw holding the top-plate on.

The placement of screw 2 would indicate it is there for something other than to hold on the plate.

Pull the stem all the way out and while holding pressure on it, loosen screw 2 a few turns and see if it comes loose. Take out the stem and snug the screw back up.
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Old 17 May 2008, 01:23 AM   #4
MrClean
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thanks -

will do when screwdriver set comes in
it apparently wants a .50 or .60mm screwdiver

and that's the movement used in the 7922, 7924 & 7928
in the 7928 they started rhodium plating the movement
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Old 18 June 2008, 05:36 PM   #5
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defnitly screw 2
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Old 28 June 2008, 11:10 AM   #6
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I have been messing with so ETA movements and taking them apart and putting them back together so I can learn how the watch works. So this is just a guess but from what I have seen is that there are no screws to un screw when taking the crown out. In your pic. there is a little dot in between screw 1 and 2. First pull the crown all the way out, then take a pin and push in that dot in between screw 1 and 2. While you have it depressed pull the crown the rest of the way out. It should come out if it is anything like the newer movements. Hope this helps!!

Jeff
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Old 28 June 2008, 12:30 PM   #7
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tks - I'll try that when it comes back fm....

servicing - couldn't get it out with either screw, but didn't get real aggressive

set it into jack @ iww to have it to use as parts donor if he needed it for the 2 tudor 7928s he was servicing for me

will look at that when it gets back
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Old 28 June 2008, 12:37 PM   #8
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I'm almost 100% sure that depressing the little dot will work. Let me know if it does. Thanks

Jeff
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Old 28 June 2008, 12:46 PM   #9
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Larry....SCREW YOU....I mean #2...

........but do NOT turn it more than 1 1/2 to 1 3/4 turns counterclockwise or you may lose the setting lever. Then, you would have to remove the hands and dial and get the set lever screw started again and re-assmble. BE CAREFUL.
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Old 28 June 2008, 01:53 PM   #10
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Quote:
Originally Posted by jeffkirkish View Post
I have been messing with so ETA movements and taking them apart and putting them back together so I can learn how the watch works. So this is just a guess but from what I have seen is that there are no screws to un screw when taking the crown out. In your pic. there is a little dot in between screw 1 and 2. First pull the crown all the way out, then take a pin and push in that dot in between screw 1 and 2. While you have it depressed pull the crown the rest of the way out. It should come out if it is anything like the newer movements. Hope this helps!!

Jeff
hey jeff just so you know that little dot is the head of a pin that aligns two seperate plates on an axis.these older movements did not use that type of lever retention or release.that type of release would generally be a lot closer to the edge of the movement.
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Old 28 June 2008, 01:56 PM   #11
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Quote:
Originally Posted by tudorman8276 View Post
........but do NOT turn it more than 1 1/2 to 1 3/4 turns counterclockwise or you may lose the setting lever. Then, you would have to remove the hands and dial and get the set lever screw started again and re-assmble. BE CAREFUL.
STAN, what are you doing looking up these old threads??cant find anything you want to read that is more recent??I think larry sent that movement off a long time ago.
but glad to see you are brushing up on your skilzz
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Old 28 June 2008, 02:02 PM   #12
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Thanks you steven! Guess I was wrong I don't mind talking newer eta movements apart to learn about them but not the old ones. I guess I'll leave it up the the experts. Sorry mr. clean for the wrong info!

jeff
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Old 28 June 2008, 02:06 PM   #13
MrClean
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Quote:
Originally Posted by tudorman8276 View Post
........but do NOT turn it more than 1 1/2 to 1 3/4 turns counterclockwise or you may lose the setting lever. Then, you would have to remove the hands and dial and get the set lever screw started again and re-assmble. BE CAREFUL.

i remember you or maybe space-dweller had said that last time, and when 1.5 - 2 turns wouldn't release it, i didn't want to futz it up so i let it go.

but thanks for the warning again
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Old 28 June 2008, 02:55 PM   #14
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Quote:
Originally Posted by MrClean View Post
i remember you or maybe space-dweller had said that last time, and when 1.5 - 2 turns wouldn't release it, i didn't want to futz it up so i let it go.

but thanks for the warning again
Just unscrewing is not always enough... you might just have to push down a little on the screw after you loosen it up a bit. That should do the trick. (on #2).
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