Just lost my explanation post.
The jist of it is. The swat is on the bar between the stone and vise, waiting to be adjusted.
You choose your angle for your stone using angle cube and tighten in place.
You move the swat into place, matching its face to the stone face and tighten it into place. Now drop it out of the way, and proceed to sharpen.
When you change stones, you simply mate the next stone’s face to the swat, and tighten it into place. Angle is maintained. A face to face meeting.
The swat allows you to easily maintain the same angle, regardless of different stone thicknesses, with out mucking about with the angle cube.
The face of all stones will meet the edge of the knife at the same angle.
Hope that makes sense.
The swat will be a great addition.