RATCHET's left arm is removable, and he has two exchangable drill arms, and a wrench arm. He still transforms as usual, we used pieces from bionicals, drilling out a port to fit them in the arm, then attaching the arms to post that fit in the holes. The arm needs to be removed because we did loose just a bit of inward swivel to his arm by making exchangable, but we've more then made up for it 'cause his drill arm, and wrench arm are both articulated.