Recently I damascened some cherries on a .375 H&H Johansenn action with custom metal by Lee Helgeland, stocked by Gary Goudy.
In the past I normally attached floorplates to a piece of wood with hot glue, but on this job because of the toughness of the rose gold and the softness of the floorplate and the lightness of the wood block things were not a dead as the could be and it took me a long time to convince the rose gold to stick with the damascene method.
I decided to make a new fixture, and with Lee's help I came up with the widget in the following pics and I thought you might like to see it.
Basically it is a piece of round bar stock with a rod at one end in a slot to catch the hook on the floorplate and a clamp in a slot on the other end to clamp the hinge and a t shaped thing in the middle to grip the spring slot to take up the slack.