How to: remove steering column shifter arm for good

[Tagg33]

I have a 84 GMC that was once a column shifted truck. The shifter arm has already been removed from the column but otherwise all the internal parts are the same. I seem to remember an episode of Musclecar on Powerblock TV were Rick showed how to remove the necessary parts and with a little work the column looked like it never had a shifter. Does anyone know what the steps are? How do I remove the linkage arm at the bottom of the column. I attached a pic of the bottom of my column you can see a tensioner is being used to keep it from rattling and moving.