TEVO Tornado anti-backlash feed tube spacer

#Problem
For those experiencing stringing on their prints,
I present the super-sophisticated Spacer (tm)

Seriously, I noticed suggestions to play with the retraction value to reduce stringing when printing. I wondered why different values would be needed (other than for different materials). So I watched my printer over a couple of prints and noticed that the compression fitting used at the extruder had about 1mm of play between the compression fitting and the nut.
As a result when the ext