Today I took the door panel off to repair a door check that was torn from the bottom 2 spot welds and starting to develop a crack in the upper corner of the cup that the door check bolts to. Drilled 5 holes around the circumference of the cup that the door check bolts to, all near existing spot welds since there is adequate flange to bolt to and 2 additional holes were drilled on the door panel face where I could feel a flange that I could bolt to. All holes were drilled through the same material where the spot welds are. 6-32 screws with washers and locking nuts were placed in these 7 holes. Some were difficult to get access to but using a magnet and other means all nuts were applied to each of the screws. The 6-32 screws were chosen since they were the largest size where the washer and nut would fit on the existing flange material on the cup. I do not think #8 screws would work and #4 are quite small.