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sneed12

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Posts posted by sneed12

  1. Well, this is an eye-opener. I never noticed that the layout of this particular movement was different from the others.

    So, this means that there are at least 3 distinctly different (not all parts are interchangeable) A7750 versions (are there more?).

    - Low beat (21,000bpm) A7750

    - High beat (28,800bpm) A7750

    - Daytona Seconds-at-6 A7750

    This may explain why, even though I've replaced parts in my daytona movement (with parts from a High bt A7750), it's not working (the escape wheel won't engage properly).

    Thanks for the info.

    I think you misunderstood what ubi said.

    In a very real sense, there is only one configuration of the venerable 7750 movement. All 7750s have exactly the same subdial spacing and layout.

    Reps which have different configurations of the subdials use a plate installed on top of the movement, which use transfer gears to move the subdials into different positions. Depending on how much movement is needed, this can end up being quite complex.

    However, all movements derived from the 7750--movements like the ETA/Valjoux 7753--use this same idea. The 7753 has transfer gears which move the output shafts to a different place, but unlike the rep makers' transfer plates, the movements are designed and built with this modification in mind, and the transfer gears go underneath the calendar plate. In other words, it's the exact same idea, but a different (higher quality) execution.

    The Rolex Daytona uses a movement that's entirely different from any flavor of 7750. It's a Rolex in house movement. Therefore, all three subdials need to be moved (which involves a lot of gearing) including the seconds subdial (which sees the most wear, since it's running all the time). Also, the transfer plate installed on the front of the movement makes the overall thickness even greater (which is bad, b/c the 7750 is too thick to begin with) and increases the stem height (which is bad, for the same reason). That's why all rep Daytona cases have serious flaws--they HAVE to be bigger than a gen case, or the movement won't fit inside.

    The actual base movement without the transfer plates, though, should be a standard A7750. You should in principle be able to swap any A7750 into any seconds-at-6 Daytona, pretty much, as long as you match low beat/high beat.

  2. What movement is it?

    The GMT wheel sits on top of the movement, and it needs some pressure against the movement to stay connected to the calendar gear. Like Ronin says, if the tension washer is missing/out of place/got flattened it won't work.

    Easiest thing to do is just take it apart and put it back together. If nothing is actually broken that should fix it.

  3. Just convert your WM9 into a tt, you've already got the dial

    Another good point, if you have a WM9 Sub you can convert to TT with bezel, bracelet, crown, dial, and bezel insert. Not too much stuff. You could even do that to one of the currently available TW's.

  4. I came across a Noob Explorer II case a while ago, and I'd been saving it in the parts box for a gen dial build. But then life happened (those who saw my big sell-off last week know what I mean) and I couldn't afford to spring for a gen dial.

    I sold it, and the member who bought it asked if I would be willing to assemble his gen dial franken for him. Here's some pics.

    100_3614.JPG

    On the left, the noob case. Gen dial is in the plastic thing. The uncased movement and hands are from my personal Explorer II rep, I wanted to closely compare my dial with the gen dial (mine is pretty good, but not perfect, and compared to the gen of course the lume sucks!). You can also see the DWO which is going to have to be installed since the donor rep (on the right) has the date window in the ETA position.

    100_3618.JPG

    Donor rep. Has Vaclumed hands, but other than that is pretty mediocre. The dial opening is too big to take the gen dial, it falls right through (I checked).

    100_3623.JPG

    Movement uncased. You can see the date window position clearly. This was a problem, because on GMT watches there is an additional gear to allow independent adjustment of the GMT hand. You'll see in the next few pics.

    100_3625.JPG

    Back of gen dial

    100_3626.JPG

    and after the feet were removed

    100_3635.JPG

    Pic of movement after installation of datewheel overlay. You can see that the datewheel overlay, because it comes closer to the inside of the movement, actually overlaps the gear that adjusts the GMT hand. I had to remove the gear, and sand it down carefully--not enough and it'll rub on the underside of the datewheel / make date changes hang, too much and it will make the GMT hand adjustment not work. I ruined it the first time by sanding too much :) good thing I had a spare. You can also see that the center wheel that holds the GMT hand has some springs and whatnot on the underside (the slots on it are the tells); that's what makes it a jumping hour GMT.

    100_3637.JPG

    Gen dial about to go on

    100_3638.JPG

    As you can see, I glued the dial spacer ring to the back of the dial after removing the feet. This is pretty much the only way I've found to do this--I've tried very thin double sided tape, which can work ok sometimes, but glue is better. This ensures that the dial doesn't slide around, which would screw up the date window position.

    100_3639.JPG

    dial installed

    100_3627.JPG

    hands installed. I flip through a lot of dates setting the hands, trying to get the date change right at midnight. It's much more of a PITA on these jumping hour GMT hands. If you have the regular GMT mod, you just put the GMT hand anywhere and adjust it after you set the hour and minute hands, but on the jumping GMT you have to set the GMT hand as well and it tends to jerk a bit at midnight. Really annoying to get right, but not impossible.

    100_3629.JPG

    Cased up

    100_3630.JPG

    Crystal on

    SAM_0094.JPG

    Close up under the loupe

    100_3634.JPG

    Finished product. When I pressed the bezel it made the crystal turn a tiny bit and the cyclops wasn't quite right, so I pulled it and re-pressed it after this pic. Also, you can see a speck of dust on the dial just below the center hole, I blew that off at the same time.

    Very happy with how this came out. I wish I could have afforded to buy the gen dial off the member whose watch this is :) but failing that, this is a pretty close second.

    The only thing I wish is that the case was in a bit better shape--I got it used, and it was... not beat up exactly but pretty well used. I rebrushed the bracelet and polished the sides of the case no problem, but the bezel is a bear to refinish and I know it doesn't look good as new. If anyone out there has a Noob Explorer II bezel that's in good shape that they want to contribute to this project let me know. Or if there's a decent aftermarket one. Or if someone has a suggestion on how to do a better job rebrushing the bezel.

  5. To answere peoples questions about the 3135 movement the guy is willing to show me all 31 jewels in person before purchase.

    To reiterate--I don't think you know what you are talking about.

    He says it's not the crap clones that are 25J he sells these clones for 400+

    Just the jewel count does not a "clone" 3135 make. It's like counting the number of cylinders in a Porsche engine and a Honda engine and finding that they're the same.

    A "clone" 3135 would be a movement which could take parts from a Rolex 3135 movement. That's almost certainly not what you're going to get--and again, if you are for $400, I want some.

  6. As for the clone movement I have a source that actually gets a 31 jewel cloned movement that takes gen hands and gen dial and he is selling me a gen dial for 110.00 bucks for the 16610 and if it fails I have a 2836-2 movement lying around that I can slap back in there.

    If you can get gen dials for $110 I'll take 30 of them.

    And a movement CAN'T take both a gen dial and an ETA dial. The feet are in different places.

    I'd like to know what you think a "31 jewel cloned movement" means. I bet it doesn't mean what you think it means.

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