On trying to do a simple job for a friend, I need to drill a hub back plate to take the small countersunk screw that holds the brake disks on to the hub.
Only thing is I am not sure of the thread size. I believe it could be 1/4 UNF, when I try a bsf screw it will only go so far in to an existing threaded hole.
Can anyone confirm what is used. The car is an old MGB. Or even what is used on modern cars.
Adrian