From Fransico on RG etc.   Some gen watches employ an ETA 7753 movement. This movement is quite similar to ETA 7750, but the minute counter is at 3 position, whilst 7750 has the minute counter at 12.   As there is no rep of the 7753 movement, reps factories use a modification of the Asian 7750. This mod moves the minutes from 12 to 3. However, this mod produces a sunken Date Wheel (DW). Therefore, it is very easy to detect that the watch is a rep.   The objective of this tuto is to solve the problem of the sunken DW of modified Asian 7750, to move the minutes from 12 to 3, simulating a 7753.   First of all, let us check the final result, to clarify the objective.   Before the tuto: After:   Let us find out why the DW is sunken and how we can solve it. Next picture shows better the sunken DW problem:   After removing the dial, the modification is visible. With 3 gears is possible to move the minutes from 12 to 3. However, the DW is below these gears, and that is the origin of the problem we want to solve.   The solution consists of placing another DW on the top of the gears, just at the same level as the DW is in the 7753, very close to the dial.   However, next picture shows the problem…. There is very little space available … it is a very complicated mod…     There is only 0.8 mm from the DW to the top of the movement. And the gears take aprox. half of this distance.   The idea is the following. We are going to manufacture a ring that will be placed where the red circle shows in next picture:     This ring has to be taller than 0.4 mm, taller than the gears. However, let us remember that the total height is only 0.8mm and the new DW has to be placed on the top of the ring. The problem is that the DW has a height of 0.52 mm. Therefore, the total length of ring + DW will be more than 0.8 mm, and the DW will touch the dial. It is extremely complicated. Solution is to modify the top DW.   In addition, there is another problem. Next picture shows that if a DW is placed on the top of the gears, the teeth of the DW will touch in some places, and the top DW cannot rotate.     Therefore, the teeth have to be removed. Two tasks to be made: reducing the height of the DW and eliminating the teeth. And with extreme precision, because the total length has to be 0.8 mm.     1.- MAKING THE RING.   Material for the ring has to be very strong steel because the ring is extremely small. I have employed a watchmaker lathe. A normal lathe is not useful, due to the high precision required.   First step is to turn a steel tube. Here turning the exterior:     Polishing:     Turning the inside face:     The final ring is really thin… 0.35 mm     And now we have to cut it. This is really complicated, due to the high precision required. After several trials I have found that the best way is employing the milling attachment of the lathe with a diamond cutting disk.     Follows a video that shows how the ring is cut… Amazing.     A picture of the ring. It is a very small part… and it has to be very precise…look such a small dimensions…     2.- MODDING THE TOP DW.   For the top DW I have employed an ETA 7750 DW. If the gen watch uses a special font DW, and the rep has this font, then we have to use this special DW for the top, and the ETA DW for the bottom.   Next picture shows the back of a gen ETA DW. It is golden, because the material employed is brass. The DW is fastened between a grinding wheel (white) and a washer (black). Numbers (font) of the DW are protected using a plastic. Next step it is to reduce the width of the DW.     This video shows how the width (or height) or the DW is reduced:     Next step is to take out the teeth. This is the last step, because the teeth are used for fastening the DW. Again the milling attachment is employed.     Finished parts:     3.- ASSEMBLING.   To glue the ring to the top DW I have employed Araldit 5 minutes     To glue ring + top DW to the bottom DW I have employed Hypo Cement.     Before gluing, we have to check that everything fits well:     And we have to check that the minute counter works well, i. e., the top DW is not touching the gears of the mod.   Last step is to glue the top DW with ring to the bottom DW. Employing Hypo Cement or similar we have time enough to adjust the position of the top DW. This is an easy task…you only have to rotate it. The tight tolerances place the top DW is its correct position, you only have to rotate it.   And this video shows the final result:     The original idea of this tuto is from my colleagues Okabum and Vikingo. Thanks, friends.   Francisco.