To be clear. I was saying you probably have a Unified Standard No. 12 thread size. Not 7/32. Not metric. Finding a 12-28UNF screw is tough locally at hardware stores. They are as rare as Hens Teeth. The B1 would not be metric.
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn
The B1 would not be metric.