Thought i would share my experience replacing the ignition barrel on my VZ. Particularly, the bits that arent mentioned above.
Firstly, unless you are keen on fiddly things, if you purchase the replacement ignition barrel, take the old barrel and the new barrel to a locksmith. Seriously. I spent hours working it out. The locksmith could probably get it done in 10 minutes and charge about 20 bucks.
If you are keen on recoding the new barrel yourself:
Leave the key in the barrel as you remove it from the steering column.
Slowly remove the key a few mm at a time.
As you pass each of the key sliders (whatever), note the position and number on the slider you will need to put the sliders in the exact same configuration in the new barrel.
Take the new barrel and insert the new sliders in the same configuration as the old.
Important: Make sure you insert the key barrel into the housing and turn it, it should turn freely. If not, you have the wrong key slider configuration.
To reinstall the barrel:
Ensure that the locking pin and all key sliders are inserted into the key barrel. The sliding pin should also be inserted at the rear of the barrel housing, locking the barrel into the housing.
Important: Before you insert the barrel and housing into the steering column make sure that you push down the lock inside the steering column where the barrel was removed. The lock is right at the back of the housing, and is U shaped. You can do this using a screwdriver (I did). It should click into place.
Turn the key to the ON position in the barrel and insert the barrel into the housing.
DO NOT try to force the new barrel into the steering column, if it does not slide right in first check if the key is in the ON position and that the lock inside the steering column is clicked into place. The latch on top of the barrel housing is really brittle and can easily snap. (I snapped my new barrel housing and had to use the old one in the end).
These few lessons, in particular the bit about the lock within the barrel housing had me cursing and yelling at the thing for hours.
Hope it helps others out there from making the same mistakes.
BTW whole thing cost me 40 bucks for the ignition barrel and 6 hours of my time. I reckon if i had to do it again, i could do it in about 20 minutes. :boxing: