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So onto my 7750 venture and its taken me 6 months but I am there......well almost. One thing I just havent been able to get confident with is the balance work, IE hairspring, regulator, etc etc. I have tried and practiced and destroyed. Lol. Its expensive training.....lol. Anyway I think when it comes to the balance assembly id prefer to leave that to an expert. I have these parts and am looking for someone to put them together for me. Id be willing to trade a favors if at all possible. I honestly dont expect free service but im also not going to pay rolex shop prices. Anybody interested let me know.....or if you think you can coach me through it. This work just seems like its on another level all together. d64e8150c4f9e62f56f95b619cf4e4f0.jpga5c4e4d3e41e59bed2eebbea67f76f9c.jpg

 

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I would put your 7750 aside and take some cheaper o watches and practice in them first, balances can be tricky, however only way to learn is to practice. Was a few years before I started on 7750s

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I agree with jnash, putting this project aside, tricky regualtor pin and stud installation.There was talk of some video on the forum showing how to install the pin and stud Best to invest time reading on and practice before you attempt.

I once damaged the regulator arm when trying to install the pin. 

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Ive had a lot of folks give me that exact same advice.....although my wallet wouldnt agree but im glad I didnt listen. The 7750 was the movement I began on, I quickly picked up the elgin 462, and then subsequently the venus 170 when I learned of the castle wheel mechanism. So essentially I have 3 builds going on at the same time where I have been hopping back and forth. I ran into this same problem with the balance assemblies on the 170 and a guy who has a shop TX built them for me. I may reach out to him. I have some ideas on building some specific tooling to assist in putting these together. This may sound crazy but it seems as though the issue is for me of a physical nature. I just dont think I am steady enough to do the work. Anyway if you happen to have the link to that video send it over. Ive watched plenty and its not a matter of understanding.

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Hi, So far as I know the forum places no limits on the number of questions one can ask.  Personally I enjoy talking watch repair to you.really :geek:
Lol. It is a fascinating subject for sure. I completed my second 7750 movement resoration last night. This time it was perfect on the machine with no adjusting. Im also getting faster and faster at putting this thing together. I did end up sending out the balance work. I will tackle it, just not yet. ecc7b452dab552b200de1cb32b110b04.jpg

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    • in general this shouldn't be any change. but in general questions like this it be nice to know the specifics of the watch in other words how was it performing before it was cased up and what is it doing now.
    • just as a reminder this watch is a Swatch group product. This will bring up a problem like spare parts and technical information. that I found some links to some information on when I talk about your watch and some of the technical and basically your watch is equivalent to 2834-2 for which I'm attaching the technical sheets. But equivalent does not mean exactly the same you want to do a search on the group for C07 as we discussed this watch before including the technical differences how it's supposed to be regulated and basically because it's watch group there is no parts availability. https://calibercorner.com/eta-caliber-c07-xxx/   https://www.chrono24.com/magazine/eta-movements-from-the-2824-2-to-the-powermatic-80-p_80840/ https://www.watchuseek.com/threads/h-10-movement-details.4636991/ eta CT_2834-2_FDE_481857_15.pdf
    • people be honest.... Swatch is evil for the watchmakers and repairers, BUT not everything in watches from Switzerland is from the Swatch-Group. As far as i know, Selitta got sacked by Swatch as a Movement-Assembler for them and they started to produce Movements in their own Name with slight Modifications. As far as i know, they sell Parts to the Market for their Movements. In most cases, if a ETA-Movement fails, it is a valid Option to replace it with a Selitta Movement, which i consider the Solution for this Mess with the Swatch-Group...... I have no Connection to anybody at Selitta, but being a Swiss-Guy, i still like to have Swiss-Made Watches, but not from the Swatch-Group.   ok ? regards, Ernst
    • Just one more greedy act by Swatch. They started a number of years ago here in the US..cutting off supplies to watchmakers that could build complications that many Swatch houses couldn't even touch. Old school masters who had gone through some of the most prestigious houses in the world. Otto Frei has some statements on their page about it. I tell all my customers to avoid new Swiss watches like the plague,..unless they just want an older one in their collection that still has some parts out on the market, or they have really deep pockets and don't mind waiting months and paying through the nose to get it back. Plenty of others to choose from..IE Seiko,..or other non-swiss brands Even a number of Chinese brands are catching up with the Swiss,..and I think that in time, their actions will be their downfall
    • Yes. If that's not what you are experiencing...start looking for something rubbing. A 1st guess is that one of the hands is rubbing against the hole in the center of the dial. Especially if you now have lower amplitude in face up/ face down positions.
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