Yup, I did use spare sockets to make sure the headers for each ROM chip were aligned, but I don't think there's any way to stabilize the gap *between* the rows of headers for the lo and hi ROM sockets, since it appears to be a non-standard spacing. So while my headers for each ROM socket were exactly 0.6 inches apart, I think the gap between them may have been slightly off. I guess I could try soldering everything together while it's actually plugged into the logic board sockets, that would guarantee it should fit.