There has been more than a little discussion recently about collapsed tops, occasionally with carved/hybrid basses but mostly laminated, and corrective measures often are prohibitively expensive. Which got me to wondering, why not support the top with an interior wafer? The National N850 electric bass and the KustomCraft Bone Buzzer both use internal wafers as their top-support brace, eschewing trestle bracing, soundposts, or the insufferable center block favored by semi-hollow electric basses. These wafers are about 3/16" thick and support only that part of the top that must resist direct down pressure from the bridge. Of course, on a DB one would have to be careful to not run afoul of the bassbar and soundpost, but a wafer running maybe an inch and a quarter in both directions from the center notches of the bridge should be all that would be required. And it certainly would bolster the top. I do not suggest this for carved or hybrid basses because the wafer would inhibit top vibration, but for plys I wonder if wafers might be worth considering.