Hello all, I have been making kitless/custom pens for about six months. I use a standard wood lathe. I normally use a triple lead m12x.8 for the Cap to body threads, and m9x.75 for the section to body threads. The issue is I cannot seem to make a pen where the cap and body have reliably the same width at all three points on the triple lead threads. I thought it was some sort of out of round error, but I completely re-aligned my lathe and am having the same issues. For my process, I do the threads first and turn each part on a brass mandrel. Any thoughts? Here is an example of the alignment I am attempting. Thank you.