Nothing fancy...quick version here, these are various size hex nuts with bearing held in place with hot glue. clay, puty, caulk, etc...can be used to add the weight and seal the gaps more aerodynamics and quieted flight.
Hex shaft and dodecahedron (12 sided die) are excellent manglers of things, but I did not have any on hand.
Hex shaft and dodecahedron (12 sided die) are excellent manglers of things, but I did not have any on hand.