I have been waiting a long time to do a Dubois Depraz module, as they have a reputation of being fiddly and parts are hard to find.The movement is very dirty.There is a screw that has fallen out of the rotor bridgeI start by taking the auto winder mechanism apart. I also find the rotor bridge screw lodged in the movement.After removing the screw the movement starts up again.The watch is fully wound and preforming like a drunken dog, considering it is an ETA 2890.Here you can see the dial side of the movement and that there is a connecting set of gears that engages with the Dubois Depraz module. The pinion is press fitted onto the forth wheel pivot and is removed very carefully so not to damage the teeth. Here I have removed the gear train cock and you can see there is plenty of dirt all over the place.... and plenty of solidified grease under the barrel bridge.The old mainspring.Here you can see the backside of the Dubois Depraz module and it is covered in small fibres and dirt.I have taken the module out of the case and you can see the dial and hands have received some punishment. I start taking the module apart from the dial side.I have removed the plate covering the chronograph layer.There is specs of dirt all over the place as I remove the various components.Almost taken apart.I have cleaned the chronograph module and the movement separately so not to complicate things more than necessary.I start by putting in a new mainspring.I see that the balance moves freely after oiling the cap jewels.I put the gear train back in. Everything looks so much better when clean!I put the setting mechanism back in place.The movement is preforming much better.Now for the Dubois Depraz module I will follow a detailed assembly manual provided by Omega.The parts are clean and ready to be put back together.Following the manual I put one part in at a time.Slowly does it.After a long process it is finally ready for chronograph module covering plate.Finely the chronograph is back together and the hammer position adjusted.I put the movement back in the case.Then I put the auto winder back in place.I have polished the original crystal and repainted the hands.Proof is in the pudding when the chronograph is engaged.A very nice looking chronograph.