Insert key, turn to position 1. Pull steel sleeve away from tumbler (it covers the hole).
Turn key back to position 0 and remove key and sleeve.Insert key, turn to position 1, insert small screwdriver, etc into hole, pull cylinder out.
Install in reverse order.The sleeve will only pull up in position 1, and since you cannot remove the key, you must turn it back.
Don't wait until it won't work, a much larger pain in the sitting part. Peter
