An animal chew , comprising: a first elongated half ; a second elongated half rotatably secured to said first elongated half , wherein said first elongated half and said second elongated half rotate around an axis of rotation (A-A); a locking pin oriented along the axis of rotation (A-A) and retained between said first elongated half and said second elongated half , said locking pin including a detent exhibiting a cross-sectional geometry (G d ), wherein said locking pin slides up and down said axis of rotation (A-A) into a locked position and an unlocked position; a locking hole for receiving said locking pin , said locking hole extending through said first elongated half and said second elongated half , wherein said locking hole includes a locking cavity having a cross-sectional geometry (G c ) similar to said cross-sectional geometry (G d ) of said detent , wherein said locking cavity is present in both of said first elongated half and said second elongated half , wherein at least one surface of said locking cavity interferes with said detent to prevent rotation of said detent ; and a chamber having an opening and an interior volume , wherein said chamber is formed in at least one of said first elongated half and said second elongated half ; wherein, when said locking pin is in said locked position, rotation of said first elongated half relative to said second elongated half is impeded and, wherein, when said locking pin is in said unlocked position, said detent is positioned within only one of said first elongated half or said second elongated half , allowing said first elongated half to rotate relative to said second elongated half ; wherein, one of said first elongated half and said second elongated half comprises a flange with a retention feature and the other one of said elongated halves comprises a channel with a further retention feature for securing said first elongated half relative to said second elongated half by receiving said flange in said channel . a first elongated half ; a second elongated half rotatably secured to said first elongated half , wherein said first elongated half and said second elongated half rotate around an axis of rotation (A-A); a locking pin oriented along the axis of rotation (A-A) and retained between said first elongated half and said second elongated half , said locking pin including a detent exhibiting a cross-sectional geometry (G d ), wherein said locking pin slides up and down said axis of rotation (A-A) into a locked position and an unlocked position; a locking hole for receiving said locking pin , said locking hole extending through said first elongated half and said second elongated half , wherein said locking hole includes a locking cavity having a cross-sectional geometry (G c ) similar to said cross-sectional geometry (G d ) of said detent , wherein said locking cavity is present in both of said first elongated half and said second elongated half , wherein at least one surface of said locking cavity interferes with said detent to prevent rotation of said detent ; and a chamber having an opening and an interior volume , wherein said chamber is formed in at least one of said first elongated half and said second elongated half ; wherein, when said locking pin is in said locked position, rotation of said first elongated half relative to said second elongated half is impeded and, wherein, when said locking pin is in said unlocked position, said detent is positioned within only one of said first elongated half or said second elongated half , allowing said first elongated half to rotate relative to said second elongated half ; wherein, one of said first elongated half and said second elongated half comprises a flange with a retention feature and the other one of said elongated halves comprises a channel with a further retention feature for securing said first elongated half relative to said second elongated half by receiving said flange in said channel . <EOS>