Reply by niki

Thank you Jim

The single roller “feather board” is not spring loaded.

Under the unit, I made a few holes that I can push a dowel in. The dowel is getting into the miter slot and serves as a pivot.

I just push the unit (the dowel) into the miter slot, adjust the angle and when I start the cut, I’m rotating/pushing the unit counter clock-wise to push the workpiece firmly toward the fence.

It’s the same action/result like you do normally with your left hand but, with the roller, the left hand does not have to move with the workpiece and stays far away from the blade and the blade line…

Regards
niki