One of the drills I was taught early on to practice disengages was to take my sword and do half circles around the bottom of a doorknob, without hitting the doorknob. I never really liked that drill for a few reasons, the main one being is that the standard doorknob height is really too low for me.
Remembering a conversation I had with Melchior zum grauen Wolf about a similar topic I was talking to Don Diego Miguel Munoz de Castilla at the Quintavia practice about it and as a result, came up with this.