I have a 12 Rivet rear end that came as a spare with a car I purchased. It has been rebuilt with modern bearings.
I can't get the outer bearings out. Is there something I'm missing?
The outer end of the bearings have two #6-32 tapped holes, I have put screws in them tried using a gear puller but it wont budge.
Is there a locking bolt where the grease cup usually is?
There should be a small Allen screw in the grease cup hole.
There was a hex head bolt that was screwed in through the grease cup, which I removed prior to trying to take the bearing out.
From what I can see the bolt was screwed into the bearing housing.
Not all modern safety hubs used a bolt through the grease cup hole. Some used a bolt in a new hole maybe on the other side. There is another type that a plug was pressed in the axle tube and has a bearing holder mounted to the hub. I just had to have one of the later types machined out after I cut back the weld holding it in because it was a very tight fit. I was able to use an axle to pound the first one out.
If you pound it out be sure you are hitting the plug and not the rivet ring.
I have seen one similar to mine that used a bolt to hold the plug in. Yours sound like the type that the plug was pressed in and has the bearing retainer mounted on the hubs.
A photo of the what you are working with would be of help.