Whenever I am working on Parkers and find something interesting in the process I try to document it in case there is any general interest in it.
In this case, I was taking apart a pretty early hammerless DH 1 frame 12g. Serial number 62,XXX.
I found something interesting when removing the mainsprings. The plungers have two grooves in them. Not the usual single groove.
I have worked on other hammerless guns even earlier than this one and have not observed this variation before.
Below is a photo of the subject plunger on the left compared to a conventional one on the right.
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