If that added wooden strip wasn't there I would have a slightly larger gap, doesn't seem as big as yours however with that added strip it does cover the gap. Does your bow have nail holes in it from that strip? Mine looks like this was original but who knows, could have had a new top installed in the 50'S and could have been added, but if it was added they did an excellent job because it was a perfect fit? I can agree with the other comments on the flexing and warping of the bow over time with a tight fitting top? Also sorry for the confusion the metal bow I'm referring to is the one forward of the rear wood bow as seen in the attached photo's, it looks to me like there is a specialty bolt needed to attach this bow? Thanks Dave