I've spent ages on these, well not actualy on these two but the four other failures. Months ago when I first bought the tap and die I did a test in some cherry which produced some perfect female threads. So I preceeded to make 4 "rings". The last process of which is to tap the threads. Every one refused to cut a thread
So I am left with one in lignum vitae and one in yew. I will be making some more in yew soon I hope.