I recently bought a vintage Stanley Bailey No. 4 (Type 19 I think, I am new these tools) and after lapping sole and frog surface and putting it back together I found that the iron is skewed and I have to put the lateral adjustment lever almost completely to the right to get even shavings.
Whatever I try to align the frog, either the iron is skewed vertically or not perpendicular to the throat. From the top it looks fine:
But when I put in the iron (lateral adjustment lever in the middle) it looks like this from below:
When I look at the bottom areas where the frog rests on the sole, they seem asymmetrical (I filed one of the inner edges, because I thought it was stuck on some paint). I added lines to make it more obvious.
And the side which has the smaller contact area in the picture above also seems to be fatter if I look on them from the front:
The iron is pretty square and flat. I also tried an different cutting iron from a No. 5 and the problem is the same.
Am doing something wrong or is this a defect of manufacturing? Is that possible or even common for Stanley Bailey planes (of some era)? And if so, how can I fix it? Should I try to file it down? I guess I would have to correct the upper contact area, too?