John I am clueless and was hoping someone who knows would answer. 
This is just a wild guess.
Have you tried pushing down while turning?
Like the lid on a pill bottle?

-Steve

On Friday, January 28, 2022, 08:27:12 PM EST, John W9DDD <[email protected]> wrote:


Should have started this with "what am I doing wrong?"

John, W9DDD


> On Jan 28, 2022, at 5:26 PM, John, W9DDD <[email protected]> wrote:
>
> My recollection is, 90 degrees clockwise to remove.  To install, bottom of symbol points to left, then 90 degrees counter clockwise to lock in place.  I don't remember having to use any tools to do this last time 60 years ago, but the darn things don't want to twist the 90 CCW.  Maybe I'm getting feeble?
>
> --
> ---
> ----
> The above comments or recommendations are SWAG. Use at your own risk.
> John, W9DDD
>
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