[stumpstalker]

I mistakenly believed the dome was on a pin HEAD, but, as Dean indicated the domes are not on a head, but are merely a rounded shape at the END of a single through-pin. So, my drawing with an assumed mushroom shape was way off.

This may in fact be a replacement pin that was just cut a little too long, and is too thin; so that when loose, it just shifts as it is now doing from side-to-side when tapped in from either side. And, since it is one long pin, it never approximates the correct seated siting on both sides at the same time.

My father’s very original-condition 16-gauge VH I assume is correct and has both of the pin domes almost, but not quite, flush with the frame sides. There is a slight convexity you can see and feel.

If the pin on this restored gun does not get any worse during the next month I will try to get through the hunting season with it, then take it to a qualified smith.

A world, not in drop of water, but in a Parker pin.

Thanks to all who have responded.