I have removed/installed plenty of those “snap rings”.
There is a short but hefty spring under the lock plate that prevents the snap ring from coming out by itself (or without using the tool) for anti-theft reasons. You must push in on the plate a short distance to remove the ring.
What I usually do is push plate down a short distance, use a pair of “next size bigger than small” flat blade screwdrivers and pry the snap ring (prying against the lock plate) up to just past the snap ring groove. Remove screwdrivers, remove lock plate compressor – which will push the snap ring up for you, then remove.
The trick is on reinstall, is the order of parts. I often forget to put snap ring on BEFORE the tool. You can get an open-end wrench (Metric – but forgot size) to assist pushing the snap ring down most of the way down. Then take flat blade screwdriver to palm tap snap ring back into place. Then remove the tool.
The lock plate tool – I have seen two different sizes, SAE and Metric – and most kits come with both sizes.
The J-body columns are made by Saginaw (GM) – so I suspect something funny is going on there. A person could make their own tool and use existing steering wheel nut – if you had some time and materials to make a shorter version of this tool.
I guess it is possible to have three different size tools, one for Chrysler (shrugs shoulders).
Key locks – automotive, lawn equipment, house doors, filing cabinets, etc. – were not meant to have any liquid substance inserted into them!
If a lock cylinder needs some lubricant – the only thing to use is graphite powder (which is a very fine powder). The same substance is also used to lubricate speedometer cables or other cables. Any kind of oily substance is – NOT RECOMMENDED.
The last time I went to my parts store, they no longer carried it (to lubricate my speedometer cable) – so I had to purchase some online. The powder is so fine that if you spill any, it is hard to clean up. Not sticky at all – matter of fact, it is like Teflon, it doesn’t stick to anything - including paper towels. Even tape has a hard time picking it up.
BudW