We know that the factory that makes the lathes for Busybee also makes machines for various other companies...many of which will be natively metric machines. I wonder if the 40 tooth threading dial is intended for metric lathes?? The imperial lathes have a 8 tpi leadscrew which is equivalent to a 3.175 mm pitch. If the metric leadscrew was a finer pitch, say 2.0 or 2.5 mm, it would mate better with the higher tooth count on the threading dial. I haven't worked out if that would make the threading dial useful for common metric pitches though.You are not the first with this problem. How in the world do they manage to screw this up so badly so often!
It almost makes me think BB should do a recall!