In reply to ColdWill:
> The epoxy should prevent any water ingress into the joint. Any corrosion should be superficial. Am I wrong?
Possibly, the water might sit in the hole around the metals involved.
Like I said it's not something I'd really worry about but it's a possibility, and it can be happening out of sight. For the sake of using the same screw as the thing you're screwing it into I'd personally change the screw.
> Also I think greasing the components would be counterproductive in an interference fit..
It's not really an interference fit if you can insert both components by hand and since you're not relying on friction to hold the thing together I don't think a bit of grease would make much difference.
Smothering all the parts with your epoxy would work, but from the photos it looked as if you'd only done the shaft and head. (Ooh er missus).
I wasn't criticising by the way, I think it's a great mend.