Those of you who have used swaged buttplates with wooden boxes, are there any tricks to ensuring that there will be no gap between the buttplate and the stock at the bottom of the box lid dovetail? The last one I made would fit nicely around the edges, but has a peened surface on the inside where I would cut for the box lid and would be difficult to file down. I should mention that the one I am making will probably have a long, acanthus leaf tang, so it will be difficult to scrape or file the concave inner surface of the plate where the box lid will go and just leave a little extra wood and inlet straight in.