Door Lock

[Richard Strecker <dmc1219@xxxx>]

I'm in the process of rebuilding a door and one of the final items is 
moving the lock cylinder from one door to the other. The donor door 
cylinder is held in by an easily removable slide clip, the old door 
looks like the cylinder was pushed in and is captive by a plastic ring. 
Any ideas as to removing the one with the ring?

Thanks in advance,
Richard