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Hi Rogart, then I will replace the disc as you suggested then I know it will be right. This watch is teaching me much.

The part that is missing is still on the movement. You will have to take the little brass ring that sits on the hour wheel off. Then you can remove the star shaped gear by lifting it up. It's tricky to put the star back in the right position but can be done. But need to be in the exact same place as it was before. Easiest is to replace the disc. Is it a 4 a clock crown on your watch.

At the beginning of my watch and clock repair class tonight one of the lecturers had a verge pocket watch that needed the pivots polished on the balance so he brought it in to show a safe method of doing this. The issue with this compared to a normal balance is one of the pallets are very close to the pivot and if you are not careful its very easy to damage the pallet when you polish the pivot.. Below is a photo of the balance and although the pallet is out of focus you can see how close it is to the pivot Before you attempt to polish the pivot you need to protect the pallet. Here you can see the pivot set up to be polished on the Jacot tool with a small wheel which was removed from a junked cheap Japanese watch just slid over the pivot and sitting hard up against the pallet. It had been sanded down in thickness so it was the same thickness as the gap between the end of the pallet and the start of the pivot, providing a barrier to protect the pallet. Photo from the other side. And once the pivot had been polished and burnished how it was protected again when rounding off the end of the pivot Other side Job done. Something so obvious when you are shown it, but not something I would of thought of doing myself

Put the spring in by hand and don't use a winder then you know it is hooked on, but make sure that you bend the the last 5mm

So you got a replacement crown and stem? 1. If you've trimmed the stem too short the crown will bottom to soon an won't allow full movement. 2. The crown design may not allow full movement. 3. If you are using a used crown, the crown may have dirt in the inside that prevents the stem to gVe full movement. Try pushing the crown and see if the day changes.. if it does then your problem in the stem or crown. All the best. Anil

The movement is a Cyma Tavannes and the patent number refers to a negative set stem system developed by them and as oldhippy has stated it is similar to those found on some American pocket watches.

Remove the other case screw and remove the bezel and I think the movement will push out from the front. I think this type of movement uses a winding system like some Pocket watches where the square part of the stem fits into a slot held within the barrel bridge and lower plate, similar to a Waltham pocket watch.

That's good, thanks. Glad I don't have to remove the gear wheel. Thanks for the help. yes pin lever pallet fork, it's a massive one jewel movement.

Hi Rogart. This is where I am at. You are right about pushing crown a bit further, but when I refit the dial the date wheel will advance but the day will seems to jam up.

So it started with the purchase of this Hamilton 912. It had a loose balance and upon examination one of the pivots was broken. So off I went to eBay to order a 3050 balance staff. Three came in the mail. I started by removing the hairspring from the balance and then removed the roller plate with Impulse Jewel and safe roller. I then got out my roller remover and punched out the roller and safety roller. Then I took the staff and balance and fit the balance and staff in my Staking set; flat arms on the balance flat against the Staking tools plate. I then got out my NEW staff remover. I then made a YouTube on how to use the tool. After I punched out the old stake I staked in a new one Did a good job. The next step was to put the double rollers back. That is when I noticed that the roller jewel was loose. I got out my combination tools and shellacked the jewel and tested that it was now in good. I then staked in the rollers and moved on the put the hairspring back on. I did so and noticed that the collet was cracked. I had another old Hamilton movement and started farting around with the two hairsprings. Need to use the older one so I cleaned in and installed in and put the balance back in. Now the fun started. When I tightened down the balance cock the bottom pivot of the balance staff was too big ( my mistake) and it cracked the lower jewel. So I went into my collection of jewels and found and Illinois lower balance jewel that was the right hole size and also fit the opening. I installed it oiled in and screwed on the cap jewel. Reinstalled the balance and had to take it off again and take off the hairspring and straighten it a bit as it was touching the balance arm. So once I had in all in place I noticed that the balance was not down far enough to allow the upper pivot to extend into the jewel hole. So I took a slice of watch paper and wedged it into the back of the balance. Finally that did it and with a little work in the Banking Pins I was able to get a beat. About 200degree turn is all I could get, but I had no energy left to try and get more. A new crystal is now on order and the watch works fine. What a day.Paper jammed in.Happy Sent from my iPhone using Tapatalk Pro

I`ve draws and draws full of tools that i`ve either used once or bought because i thought they might be usefull. Ive got a dial foot repair tool , never used ,special soldiers for any and all types of metal from alliminum to stainless steel, tools welders, i just like tools. So if you`ve the time Roy buy it and have a go.

This little arm is that there? And this has to be in the right position . Lifting it out until it lays outside the star on the dayring.

Hi Rogart, thanks for replying. I am not sure if I got that part right so will have to disassemble and look. The problem is that I really don't know where to look. Hopefully I will spot where I have messed up. At least now I have an idea what I am looking for.

The day is advanced by pressing the crown a little harder. In that way you turn the day ring. There is a little finger on the movement that hits the dayring. Did you get the dayring in the right position when you put it on?