That is the first batch of rads tapped, I need to re tap the 1/4" BSP fitting now as the powder coating needs to come out of the tread on them. Ill have to pick up one though as my tapping set doesn't have 1/4" BSP. I have tested fitted all the 30mm screw and every thing is perfect on them.

Got a few blisters from doing this but Meh thats life.