Angle Helper for brass thread insets

I've discovered the advantages of using threaded inserts for screw connections in 3D printed items, so I've designed a tool that helps me insert them at arbitrary angles. It uses a V-shaped arrangement of ball bearings to guide a long threaded rod with the insert at the end.

Additional items needed: 5x M3 x 3-6mm threaded inserts, 4x M3 x 8mm screws, 1x M3x16mm screw, 1 washer, 4x ball bearing 693ZZ.