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This spinner can be balanced by turning three carriage bolts in and out of the three arms. If the spinner is held vertical, it can be balanced such that none of the bolts will gravitate toward the lowest position. The o-rings were added partially to put more grip on the bolts (they could fly out at high speed), but the o-rings also give this thing a nice ergonomic grip when you give it a whirl. I also chose to go with a standard hex nut and bolt for the thumb pieces to keep with the mechanical look. Items you will need: + (1x) Printed spinner_screws.stl + (1x) 608 skateboard or fidget spinner bearing + (1x) 5/16-18 x ½ long Hex Bolt (for thumb piece) + (1x) 5/16-18 Hex Nut (for thumb piece) + (3x) 5/16-18 x 1 long Carriage Bolts + (3x) #204 O-rings (3/8 ID x 5/8 OD)