I am in need of an H&H expert. There is a nagging question to which I have no answer. A couple months ago I discussed this at some length with a prominent and knowledgeable member of this forum in a series of PM's. We are baffled for an answer. (Neither of us owns an H&H.)

Attached is a picture of the water table of an H&H Royal Hammerless Ejector .577 NE which I downloaded from the 'net and reduced in size.

My question is:

What is the purpose of the two buttons protruding vertically from the action bars?

Here's another image I pinched from the 'net. It is an H&H Dominion .577 BPE. It has similar buttons, albeit positioned differently.

What do these "buttons" do? Anybody?

Thanks,
Curl