Hi, A few things. A yuki 3135 is around $340 dollars. So if you need parts for a yuki you don't need to go gen to fix it. Buy another yuki. A Gen parts are very expensive and one part could cost you the price of a a Yuki movement. Yes you need to service it the day you get it. Yes there are a few parts that equal to around $300 dollars that you should change just because those parts are weak on the Yuki. I will post a pic of them. From memory it was the date changing gears, the min, hour pinions, winding gears and seconds train wheel. I would also do to auto winding gears in the back but not a must do. Understand that all the talk of TC 2824 and the Elabore grade...... It's a ETA clone. I can order you a brand new ETA 2824 from start time for $160 dollars. That is new gen ETA. TC makes a great watch. I have owned 3. I can tell you that they are great as is. You don't have to change anything. But you hand that watch to me. I can by just adjusting the time tell you that it is fake. But so is my watch that has the Yuki in it. Difference is that a Yuki, winds and adjust just like a 3135. All Gen parts fit a Yuki. Not a TC. You can get gen hands, date wheel, dial, even parts to dress up the Yuki. I did because I am a nut case. LOL. The back on a rolex is not clear so no one is going to see it so there is no need to change it. I would take your TC and either wear it as is and enjoy. Or if you want to have fun, get a yuki, source, gen hands, date wheel, dial, all which Misiekped who is on this forum can get and do for you. Have him replace the parts that wear easy on the Yuki, I would even get a gen crystal and Bezel insert. Have Misiekeped do it all for you and your watch will be a life long watch. It will behave and wind and adjust and run as a well oiled Rolex 16610 with a 3135. You could put that watch in the hands of any Rolex guy and he will not be able to tell that it is not real until he opens it. So the advantage to the Yuki, to me, is that it is a hell of a movement once it is cleaned oiled and serviced with some parts. At the end of the day though understand that with all the things to make the Yuki run well will cost you around $700 including the price of the movement where a clone ETA is $100 dollars. But your still $1000 less than a Gen 3135. Good thing is TC cases take 3135 with out modding. Robert Here are the parts that are changed on the YUKI for real rolex parts.