Messing about with adding ThumbStuds especially to the Blades of the CenterDrive and DualForce. These crudely carved wooden Nubbins already do the Trick. Making the "Recess" a tight PressFit is enough to hold them in Place.
As i will have to remove and replace them for sharpening the Blades, i made a Bunch of extra Blanks to quickly do new Ones