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Thanks. Well to my surprise, I found three studs that allowed .004 - .010 gap under the hub inside the drum. So the hub is not completely seated to the drum on one side. When swaging I had all studs held with 1/4" thick washers and nuts but for some reason there must have been flex. I attempted to pull them tight with the same washers and they snugged up well(a ran pretty true on the brake lathe). I had assumed the studs would have expanded between the hub and drum a bit(as in poor standard riveting) but this wasn't the case. Unfortunately, the middle stud area will not stay tight once it's nut is removed for additional swaging. I can slide at least a .0015" feeler gauge under there. There might be some hub warpage but two on the opposite side are fine and I don't remember seeing warpage when lightly draw filing the hub face. I had it in a lathe but on an old axle taper and really didn't trust the setup for machining. With the pressures used I wouldn't doubt a bit from the process now that will complicate additional pressing.
I am using a DIY jig similar to what Vince Falter shows (
https://www.fordgarage.com/pages/swaging.htm) and a 32 ton air over hyd jack in a 20 ton frame. This was my first time so I'll need to get better but not sure how to get that hub to hug the drum while in the press.
Dave