This bookshelf I am making has a 29” back panel that will use 8 3.75” x 55”x.048” ship lapped boards inserted into 1/4” deep dadoes all around. How do I keep these boards from rattling around. I have been thinking about dropping some wire insulation that I strip off some thin wire as kind of a softener top and bottom. It is a bookcase and will be full so quite heavy, but still, am I making a mountain out of a molehill? Much obliged for any direction here.