At Spokane one year I was watching her shoot OH. She never touches the trigger when aiming but rests her finger on the lever. Then moves it up to the trigger to fire the shot. She kept her shots in the red.  Told her she should have her finger on the trigger when aiming. She said she was scared to. She's busy raising children now so no shooting.

C C Johnson prototype adjustable buttplate

I would be more than pleased to use one in brass on a current build offhand single shot rifle. Right at home to my eye. Form following function.

rkba2nd,
This was Charles C Johnson's prototype that he had on his personal position Ballard circa 1932. The production units were cast aluminum. He also made palm rests. Around 1933 the NRA banned palm rests and hook buttplates citing the fact that those who could afford such items could buy an advantage over those who could not.
It is beautiful work. This rule was eliminated after WW2.

Grumpy grumpy,
The push button on the bottom cams the pin back when depressed to allow adjustment.

Thanks for that fine contribution to the discussion, Jerry.  I fear I’ve neglected my own thread for a couple of weeks due to participation in the N-SSA Spring Nationals.  I’m back now!

Your grandfather’s design strikes me as much more elegant and svelte than the later Freeland’s units.  For one thing, everything is much more compact and would require less wood be cut off the stock’s butt while fitting.  Also, the button and lock pin method of adjustment is far superior to the later method that requires a screwdriver or Allen wrench to adjust.

Once again Charley’s genius is obvious for all to see. 
Froggie

Ah, thanks for that, the spring now makes sense to me 
Gumpy