Quote Originally Posted by VPooler View Post
The most accurate insert is an DDS itself, you can cut a hole through the septum and use a diffusing gel as a ground glass. A bit destructive, yes, but rather accurate and simple.
I will see if I want to destroy one, I only have 3 DDS and they are all in good condition, I will perhaps look around to see if there are any bulk job lots of them on ebay before destroying one of the current ones lol