hanski 40 Posted August 4, 2019 My first foray into haute horology was a gen Junghans Max Bill Hand Wind back in 2012 during a trip to Switzerland. It was also the first time I’d paid so much for a watch, about 10x my previous daily (a 1940’s Wittnauer military watch). With that, I always took great care to send it out for service to the authorized Junghans service center in the USA. Fast forward to today, the poor thing doesn’t get the wrist time it used to. Now my Tudor 9411/0 takes that prize. But I still wake up everyday to wind it. But after letting it unwind fully after a short camping trip, the mainspring broke upon my next wind. Thankfully with my experience I felt confident toying with this and I decided to take this repair into my own hands. With a few simple tools I would be able to pull out the broken mainspring and replace with a new one - all without pulling the movement out or removing hands/dial/train. First thing remove the case back. It’s just an ETA 2801-2 but Junghans does a nice job on the finishing. Remove ratchet wheel and crown wheel. Remove barrel bridge. Remove crown/stem, sliding pinion, winding pinion, and case clamps. Turns out I needed to lift the movement up just a hair to slide the mainspring out, clearing the edge of the case. Check the existing mainspring - yup, broken spring as expected. Swap in a new, complete mainspring. I got this from Ofrei for ease of repair - they sell main barrel, main spring, complete and lubricated for about $25. Totally worth it. Reverse the sequence of removal to reassemble. Wind until there’s resistance and we’re back in business. And now that I’ve to tinkered with this, I think I might order a hack with my next Ofrei order. Would love to be able to hack this watch. So why the story of a simple repair? Well, it’s the fault of this forum and this hobby that I’ve gotten into tinkering with watches, so much so that I’m medaling with my highly prized gen (sentimentally speaking). Thanks guys! Share this post Link to post Share on other sites
Psssniper 84 Posted August 4, 2019 Very nice write up! I always find these posts to be a bit of a confidence booster, then when I try it, everything goes to shiat, Share this post Link to post Share on other sites
BM284 1,518 Posted August 4, 2019 Great read .... yet another quality thread that really adds value for those of us that don’t have the experience to carry out repairs (yet). On a side note your ‘tinkering’ is a rather special gift - que the builds you’ve done! Share this post Link to post Share on other sites
The_Proctometrist 16 Posted August 4, 2019 (edited) Beautiful watch and thanks I needed an uplifting feel good post after binge watching season 3 of stranger things... Edited August 4, 2019 by mmjmmj Spelling Share this post Link to post Share on other sites
Theviking 197 Posted August 4, 2019 Love your work @hanski a beautiful gen Share this post Link to post Share on other sites
Piccolo 673 Posted August 4, 2019 Opening it up and fixing it must increase the attachment sentimentally as well... Lovely watch. Thanks for sharing Share this post Link to post Share on other sites
CollieWobbles 236 Posted August 6, 2019 Great work well done Share this post Link to post Share on other sites
simey83 2,007 Posted August 6, 2019 (edited) Love it! Classic piece. I must add another to my collection. Great thread mate, cheers Edited August 6, 2019 by simey83 Share this post Link to post Share on other sites
BabaNJ 38 Posted August 6, 2019 Great write up, i have about 10 swiss eta movements sitting with various minor issues. Every time i try to do this on one of them i somehow make it worse.. Share this post Link to post Share on other sites
