P714z instruction I buy second hand without instructions

its not hard to do, the gear slides over the split lens clip from the mount end of the lens and the gear itself is right close to the flange of the mount.

There are little bits of rubber you press into the grooves of both the split lens clip and the gear to improve grip.

You take the split ring in the right orientation and spread it a little to place from the lens mount end it so it covers the rubber grip for the lens zoom ring. jiggle it around till it clips over properly.  you know it is right as when it is, it fits the zoom ring very closely. 

You work out the orientation from the fact the gear section only slides on the split lens clip from one end.

Once the lens clip is on press the zoom gear gently down to slide it over the lens clip.  remember the gear is towards the lens mount end.

A lot easier to do than describe.

This video shows how on a different lens - BUT you do not need to remove the rubber covering the zoom ring

Thank you Chris