The reason I went small on this is, I couldn't get the die started square, no matter how hard I tried, with a piece of 3/4" stock. The die would just peel the end off. With the 11/16th stock it had the ability to start a bit deeper in the die and it wasn't cutting as much off so I was able to get it to start square and concentric which is what this piece needs.
Well, after I had the threads started in the lathe I did as much as the taper grip would let me. After it started spinning I pulled the spindle out and set it up in a collet block in the vise to finish the threading. Once I had it threaded I backed the die off and turned it around so the sharper "trailing" side could finish cutting the threads all the way to the shoulder.
After taking it out of the collet block.
Mounted in the table with the draw bolt pulling it in tight.
The chuck attached and locked in place with a jam nut.
Now, on to adding detents to that spindle I was talking about previously.