panerai153 Posted April 4, 2015 Report Share Posted April 4, 2015 I have seen quite a few AP ROO's for sale on the various forums touting movement mods by VAC that include the jewel mod. Most of these seem to be guys that are selling watches that have passed through a couple of owners, and possibly the service history is vague. The reason I ask this is because a year or so back u asked the same question to VAC and he told me that he did not do jewel mods. I understood that Domi was the only one that did this mid on a commercial basis. I believe that this is important as most folks that are selling seem to put a premium on these mods. If he dies, I stand corrected, but if not, I think people should not advertise something that hasn't been done. Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Legend Posted April 5, 2015 Report Share Posted April 5, 2015 Hello A As far as I remember, Vac does not do the jewel mod. He could have added this mod to his list of offerings recently but I would not know about that. Domi does the 3 jewel mod, on all the transfer gears, and Goin does the jewel mod on the final gear. I would not recommend Goin for this mod though. He messed up and destroyed the plate on my watch after doing the mod. It caused the watch not to run at all! For Vac, no experience with him in this regard, and I do not have intention to use him. I would recommend the ETA mainspring mod over the jewel mod, A. You should have some first-hand experience about how the mainspring mod improves a watch.. OK so back to the question, and my 2 cents: Unless I see it physically, I would not take it for granted that Vac does, or did jewel mods on any sec@12 A7750 watches (namely ROO reps). Nor would I believe that he does ETA mainspring replacements, for reasons known clearly to you and me. Quote Link to comment Share on other sites More sharing options...
markiemark Posted April 5, 2015 Report Share Posted April 5, 2015 I would recommend the ETA mainspring mod over the jewel mod. Never heard of that one before! Would you be so kind to educate me? Quote Link to comment Share on other sites More sharing options...
Legend Posted April 5, 2015 Report Share Posted April 5, 2015 Never heard of that one before! Would you be so kind to educate me? Over the past few months, I have fitted ETA mainsprings (or commonly called swiss mainsprings) in my rep ROOs. Compared with the asian mainsprings supplied with the watch originally, the swiss mainsprings have much higher tensile strength, and provides much stronger force to drive the gears, overcoming the inherent friction present in the A7750 sec@12 designs much better. Also, the swiss mainsprings provide a much better power reserve compared with the asian ones. (about 55+ hrs compared with the 40ish hours for asian mainsprings). Timekeeping, power reserve, and reliability all show marked improvement in my watches fitted with the swiss mainsprings. Best $65 ever spent! I definitely strongly recommend it over the jewel mod. I own watches with the 3 jewel mod, the ETA mainspring mod, and one watch with both mods. In my opinion, all of them run EQUALLY well. So why spend more time and money on the 3 jewel mod when a much simpler and cheaper solution does the same thing, and provide better power reserve simultaneously? Quote Link to comment Share on other sites More sharing options...
markiemark Posted April 5, 2015 Report Share Posted April 5, 2015 Over the past few months, I have fitted ETA mainsprings (or commonly called swiss mainsprings) in my rep ROOs. Compared with the asian mainsprings supplied with the watch originally, the swiss mainsprings have much higher tensile strength, and provides much stronger force to drive the gears, overcoming the inherent friction present in the A7750 sec@12 designs much better. Also, the swiss mainsprings provide a much better power reserve compared with the asian ones. (about 55+ hrs compared with the 40ish hours for asian mainsprings). Timekeeping, power reserve, and reliability all show marked improvement in my watches fitted with the swiss mainsprings. Best $65 ever spent! I definitely strongly recommend it over the jewel mod. I own watches with the 3 jewel mod, the ETA mainspring mod, and one watch with both mods. In my opinion, all of them run EQUALLY well. So why spend more time and money on the 3 jewel mod when a much simpler and cheaper solution does the same thing, and provide better power reserve simultaneously? Thanks A! Would this also be applicable at the 7750's sec@6? Quote Link to comment Share on other sites More sharing options...
Legend Posted April 5, 2015 Report Share Posted April 5, 2015 Thanks A! Would this also be applicable at the 7750's sec@6? In theory yes M, but I have never owned any sec@6 before so I can only make an educated guess! Quote Link to comment Share on other sites More sharing options...
panerai153 Posted April 5, 2015 Author Report Share Posted April 5, 2015 I have the ETA mainspring mod in one of my ROO's and as Legend stated, it makes a world of difference. It is now around 48-50 hours and before I was lucky to get a full 24 hours out of the watch. I do think that while you are getting the mainspring installed, it would be god to get a full service, including a complete stripdown, cleaning and proper oiling. AFA the original question, I have serious doubts that Vac is doing the jewel mod. Quote Link to comment Share on other sites More sharing options...
markiemark Posted April 6, 2015 Report Share Posted April 6, 2015 In theory yes M, but I have never owned any sec@6 before so I can only make an educated guess! Hmmm I might get a Daytona and/or a Portuguese chrono then... Quote Link to comment Share on other sites More sharing options...
Legend Posted April 6, 2015 Report Share Posted April 6, 2015 Hmmm I might get a Daytona and/or a Portuguese chrono then... and if you do, let us know if this mod would work? Quote Link to comment Share on other sites More sharing options...
markiemark Posted April 6, 2015 Report Share Posted April 6, 2015 and if you do, let us know if this mod would work? Will do! But I have other watches on my list with a higher priority Quote Link to comment Share on other sites More sharing options...
holyangel56 Posted July 12, 2015 Report Share Posted July 12, 2015 Hi may i ask when you said swiss ETA mainspring it must be specifically for 7750 or can be any swiss ETA mainspring? Thanks Quote Link to comment Share on other sites More sharing options...
Legend Posted July 13, 2015 Report Share Posted July 13, 2015 Hi may i ask when you said swiss ETA mainspring it must be specifically for 7750 or can be any swiss ETA mainspring? Thanks Essentially its a swiss mainspring manufactured by ETA that fits the A7750 movement. Not every swiss mainspring would fit the movement. Quote Link to comment Share on other sites More sharing options...
poker27 Posted July 14, 2015 Report Share Posted July 14, 2015 (edited) Hi! Just wanted to know who can do the mainspring mod if vac doesnt do it? Thanks Edited July 14, 2015 by poker27 Quote Link to comment Share on other sites More sharing options...
Jordanf1 Posted July 14, 2015 Report Share Posted July 14, 2015 I can assure you all, Vac says hes does the Jewel mod as ive got his emails somewhere stating it, but its debatable if its even done......ive not used vac in over a year, What Mr A does is by far superior. My .02 Quote Link to comment Share on other sites More sharing options...
Jordanf1 Posted July 14, 2015 Report Share Posted July 14, 2015 Hi! Just wanted to know who can do the mainspring mod if vac doesnt do it? Thanks Spin master does it , ask Mr A Sent from my iPhone using Tapatalk from Mars Quote Link to comment Share on other sites More sharing options...
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