Steering coupler

I bought one, what a pain in the dick to put on. If column is out it will be way easier! Mine still isn't on lol.
Cheap insurance...
For those of you that have rebuilt your steering coupler, or reassembled your column / shaft, did you add the coupler retaining ring / clip if it didn't come with one originally..? My service manual doesn't show it, but I heard somewhere it was an added "correction".
Is it worth worrying about it if it doesn't get put on...safety issue..? Vs. Originality..

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I sure would if I had one.