This is not an area I visit that often as I make very few pens nowadays.
I had a blank sitting around that I had drilled for a two-part pen and managed to destroy one half of it, I also had a shock absorber pen kit which just so happened had the same size tube as the hole that was drilled in this half of the blank.
Anyway this is the end result.
Attachment 467008Attachment 467009Attachment 467007