thanks shippers, I think the forward control must be different, my 109 pickup has three screw holes in the drum and hub on each wheel, the screws go through the countersunk holes in the drum and into the threaded holes in the hub- to hold the drum to the hub. obviously the drum cant come off...

Hi everyone, I am in the process of rebuilding the brakes on my series 3 109 six cylinder. just wondering what thread the three small drum retaining countersunk screws use. Had to use the welder to get two of them out, and the threads cut into the hub now need cleaning up, but no idea what tap...