I forgot to add in my last reply that I do have some Delrin and 3 types of stock for making stems.  I'll be giving the 100% stem making a whirl soon. 
 
I like the 'warden as pictured 

 But if you work on the stem, I can see sanding the entire pipe down again.
Q&A's
Q: What shade/color dye did you use?
A:
Q: How or why did you burn the chamber?
A: