in order to buy appropriate spares in my attempt to service an Omega 175.0083 (7750) I need some advice:
I've already been suggested to replace MS:
Barrel is Ok and I'm thinking of buying a new MS and moebius 8217 for barrel lubricating as I don't want to spend money on recommended Kluber 125 grease.
Should I consider instead buying a barrel complete (assuming Barrel complete (180.1) comes with MS installed) wich supposedly comes prelubricated ?
Attached image shows automatic device bridge with evident sign of wear from where, to my understanding, the problem orginated: a screw came off
I cant find original part.
ETA part is different from Omega in that the Omega is larger and partially covers hammer two function and the chronograph cam.
Beside that and since the watch has no crystal back case I think those parts are perfectly interchangeable.
Do I need to replace the bridge or are there alternative aproaches to this problem?
I am servicing my first 7750 (thank you Mark for the YT videos and Lawson for the Disassembly/Assembly walk-through).
The movement is not new - let's say it has an obscure unknown history It appears to be a genuine swiss 7750, but with a lower grade finish (very low...)
When putting back the balance stones I noticed that there were two sizes (two pairs, because the cap stones fit the hole jewel settings). I put the smaller stone and hole-jewel on the mainplate and the larger ones on the balance cock. I tried to but the larger setting on the mainplate but it didn't fit quite right. I believe the springs are the same size - its just the stones that differ a bit (aprox 0.1mm)
So my question is: did any of you stumbled upon the same issue? Is it normal for a 7750 to have two different stone sizes?
Hey, guys, I have a 7750 movement where the rotor screw snapped off. I opened it up and it appears the rest of the screw is still inside the rotor post. Is there anything I can do to screw it back out?
If the cap jewels are seated correctly and you have not transposed them then the balance is not aligned correctly. Rule of thumb DON'T FALSE ANYTHING. By any chance when you removed the balance cock for cleaning was there a shim between the cock bridge and plate. Sometimes if a new balance staff is changed and it is bit tight a cheats way is to put a thin shim under the cock.
I'm not familiar with the tool you are using, but it looks like it is giving good results.
Screwdrivers are more forgiving than knives with shapening, to sharpen my screwdreivers I purchased a 240 grit and 400 grit diamond sharpening plate off ebay for just $3 or $4 each and have one an A&F spring loaded screwdriver holder for sharpening and find that gives me pretty good results.
The most important thing is using your Loupe to check you have inserted the screwdriver correctly before sharpening.
Also if you are removing a chip on the blade you will normally have to hold the blade at 90 degrees to the diamond plate and take a small amount off the end so they screwdriver blade once sharpened to ensure it doesn't bottom out in the screw.
Did you remove the cap stones on the balance and fully clean out the old oil?
If not the old oil could be gumming up the new oil.
Have you checked the pivots of the balance for wear?
Checked the jewels for any cracks?
Does the anchor snap cleanly from side to side if you nudge it with an oiler with the balance removed?