Second wheel on ETA 2482.2 separated

[Cyanide]

I bought a new old stock ETA 2824.2 and put it through my cheap ultrasonic cleaner. 

Im unsure of the correct terms, but the "cog" has come away from the "shaft". Can this be reattached, or do I need to look for a replacement?

Chris

[jdm]

Since the shaft also has a small cog, it's called a pinion (at least I think). Yes you can reattach it but be sure that there is friction enough to keep it firmly in place, otherwise you should close down the hole an hair. And then that is has to be true to the wheel so observe it the best you can, maybe placing it between plate and bridge and rotating it.

A truing tool like the one presented in a recent thread would be ideal.

[clockboy]

Replacement is the best option. You can re-attach but it needs to be attached in the correct position & without distorting the pinion.

[SSTEEL]

It is possible to re-press it in place using a staking set, but as CB suggests, best to renew it really.

[jdm]

A compromise could be bringing it to a local watchmaker to be put back together. You would see right away his competence, what you can learn from him, and at which price.