Bill, I determined that the one that can be seen in the picture of my DH (1898) as being a reinforcing rod/dowell because it is in the correct position for alignment right through the wrist to the stock head while the larger plug closer to the heel of the butt which can't be seen in this picture is for the purpose of altering the weight of the buttstock. If it ever had the patent stamp behind the grip cap it must have been sanded off when the buttstock had been poorly refinished long before it became mine.
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