[GreenKeys] Blasted 15 key tops

[John, W9DDD]

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?

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The above comments or recommendations are SWAG. Use at your own risk.
John, W9DDD