I have Robert Sorby threading tools. I made a case for them. I have 10,16 and 20 threads per inch. For the olive I used 10 TPI.  I'm no good with the tool support bar, so it stayed in the case for this project.

I have found MDF is good for practice. It's no good to use in threaded project, but it feels the same as wood chasing threads.

I'm probly going to let you down but, I swear I won't keep you down. John Hiatt