So I finally got around to swapping in a gen eta 2824-2 into my ZF. The rotor was interesting to remove - no special tool required, just used my tweezers to sort of… twist along the raised star pattern. I’m not sure how I would reliably screw it back down but I’m abandoning the decorations anyway so it didn’t matter too much. Then, it took me far too long and removed way more parts than I needed to, to realize I only needed to remove these 3 clips to remove the movement ring in order to access the stem release button:
Soooo after I removed more than I needed to, I managed to get the movement out. Removing the hands was easy, but the dial… took a bit more googling to realize how to pry the dial locks open. Once that was done, the tricky part that i was never good at before: swapping datewheels. Much patience here, and as they say slow and steady wins the race. Took my time and to my surprise, I was able to swap the datewheel over successfully. There’s a tiny spring that needs to be engaged to the DW teeth for things to get the right pressure etc, luckily it worked out! After that, reassembly was not bad but not without some bumps.
So, I took the ZF hour wheel, and so the hour hand fit perfectly back on. The minute and second hands however, kept coming loose and falling off. So I ended up slightly crimping both posts with a pair of pliers, and that seems to have done the trick. I’ve had to do this before on my Rolex builds, and less is definitely more here given that the first time I tried I literally just flattened the seconds hand post lol.
Anyways, everything went back together smoothly and seems to be running nicely! It’s a standard grade eta so there’s no decorations whatsoever, so I may look for a nicer rotor in the future. That said, the Eta is indeed a straight swap but you will lose the ability to use movement tabs to clamp the movement to the movement ring. The ring will still hold everything in place but the original ZF tabs go into a decorative plate which adds height to the movement. The stock eta doesn’t have this so you just have to rely on the ring itself holding the movement in the case. This is fine but where you’ll notice it is when you unscrew the crown to adjust anything. Then you’ll feel the slight wobble of the movement. I might try to hack something to add stability in the future.
So you end up with these two empty spots where movement holder tabs would have normally gone. Based on the shape of the spacer ring, in theory maybe a shaved case screw could work - if I filed down one side of the screw head, then it would give me enough space to screw it in a bit and “wedge” it against the spacer. Another project for another day lol.
Anyways, should get my ORF bracelet next week and this will be complete! One final thing I noticed was that the hands lume is a tad transparent compared to the dial. I think the easy fix to this would be to just paint some white paint on the underside of the hands to give a brighter backing… if one was so inclined, which I am not lol.
Here’s a shot of the eta movement installed - sadly without the decorations the movement is actually quite short with the rotor further away from the caseback.
Edit/Update: Added some HP1300 to the rotor bearings this morning and now it spins super quiet!