Attempt to change ignition barrel!

[SamA3]

Hi there, I'm attempting to change my 2004 audi a3 2.0tdi ignition barrel as it is just completely kaput!! It will only allow you to take the steering lock off but once you let go of the key it drops back in to steering lock! So managed to pick an ignition barrel with the 3 button key! For £35 inc delivery going to see if I can keep my transponder and change circuit boards from 1 key to another and save some pennies...