6" Column Packing and Extension

[ideasinbeer]

Howdy Folks,

Recently a still fell into my lap and I'm looking to make some mods.
The search function is kicking my butt for the last couple of days, despite my best interests.

The still is a 6" column with 6 perforated plates, which should work fine for stripping and brown spirits.

Now I'm not at all a handy guy, but am looking to add a column extension to be able to make neutral after a stripping run.
In my head I'm thinking a simple Spindle filled with packing. Reading here has taught me that the idea of scrubbies/wool won't work due to the size and potential length of the column. So then I'm looking at a huge mound of something like Raschig Rings which I'm unsure of, or Prismatic Packing or the like.

So if you're like me what packing actually makes sense? I think I can get the Spool at something like glacier tanks, but I'm not sure what an ideal length is.

Can you folks straighten my thinking out and point me in the right direction?

Any tips are greatly appreciated.

An idiot