To put them back in a have a modified bent long nose plier, its got a small pointed nose with really flat even surface, i grip the tail of the clip ( end that curves in ) and push the end into the groove, i then twis the clip to make it smaller as i push it into the groove, i then cover the hole with my finger and push the gudgeon pin towards it to make sure its clipped in. I then rotate it in the groove so that the tail is facing sideways. Beware the tail is not bent outwards in any way... it can catch when hot and total your piston