I picked up a couple of MPU 100’s that needed some work. (one Stern and one Bally). I worked on the Stern first because it was in the worst condition. I had no problem replacing the headers. Today I started on the Bally. When I removed the headers I lost over a dozen solder pads. The lost pads were not connected but they just fell off. I’m not sure but I don’t think the holes on the Bally boards are plated on the inside.
Now I got a bunch of stitching to do.