About this 3D model

Update 2017-03-20: Use Cat (pick-a-weight) Fidget Spinner for more choices for weights and number of cats update 2017-02-08: added SAE (5/16") version update 2017-02-05: corrected M8 nut size easy to print small (kid size?) uses 1 X 608zz bearing (22x7) uses 2 X M8 hex nuts the secret for easily installing hardware... vise grips