Hamilton 974 16s issue

[mclark3617]

Yea thats my theory, so I ordered a new jewel and im gonna compare them, the cock still could be bent cause originally the bottom mounting surface was peened to get the cock to come down. I will know a lot more when the new jewel comes in

[mclark3617]

Well the jewel arrived today and its the same, i got some better pics of the setting
The top is dirty I know,, I should have cleaned the new jewel before trying it,,,it will be cleaned though

• This reply was modified 4 years ago by Tamas Richard.

[chris mabbott]

Could there be a chance that the balance has been switched, does the serial match ?
It could also be that the wrong staff was installed?
Usually those items that are fixed should be fine, as in where the jewels seat into the cock and lower area plate.

Have you also measured the pivots on the staff, then cross referenced them with a parts book?
You should also remove the upper and lower hole jewel settings, mount the upper and lower cap jewels and secure them via making two brass spacers the same size as the hole jewel settings, then while the cock is mounted, measure the distance between the two cap jewels, compare this with the staff length, that should give you the measurement you need to determine correct staff length.. Once you have that, you’ll better know where the issue lies..

[mclark3617]

Ive thought of most of that, and the number on the balance does match, I thought may be the balance shaft was wrong but the measurements were close to catalog dimensions. one thing im not sure of is when I do a serial number lookup it says it has a double roller, and this looks like a single roller. I could be wrong though.
for reference the serial number is 1649219 Hamilton.
what kind of tool do you use to get in and measure the distance between the caps

[Bob Tascione]

what kind of tool do you use to get in and measure the distance between the caps

Hi MClark,
An easy way is to measure across the outside of the cap jewels when mounted in position and then subtract the thickness of those cap jewels from the measurement. If the cap jewels are inset (which they almost always are) you can often use something like a small ball bearing to reach into the recesses to make contact with the jewel. If so just subtract the diameter of the bearing/bearings (or height of whatever you use) plus the thickness of both cap jewels from the final dimension.

Bob

[randy]

My Hamilton parts catalog shows that yours is a single roller.

The upper balance jewel is Hamilton part number 465 and the lower is 466.

Also..it’s not uncommon to get a replacement old stock jewel setting where you have to slightly scrub/burnish the outside diameter of the setting to get it to seat fully onto the shelf in the cock or the plate. They get a little microscopic crud on the brass from storage sometimes.
I’m saying this because your new one still doesn’t look to be sitting deep enough,…but that could just be my perception ??

Randy

[mclark3617]

Thanks for the info..I was worried there was some frankenstiening going on and yes. It still looks like its not setting in deep enough so I’m gonna start measuring and see if its indeed all the way seated or not….it also looks like I slightly bent a pivot by measuring it. Now I have to try to tweak that back without breaking it…its just a slight bend

[Author]

Posts