One pound lead ingots, set (and removable) below the tank deck on a Vietnam era 'Tango" boat model. Doing it this way permits easy distribution of the weight to not only ballast, but level out the hull.

One pound lead ingots, set (and removable) below the tank deck on a Vietnam era 'Tango" boat model. Doing it this way permits easy distribution of the weight to not only ballast, but level out the hull.
[img]https://i.postimg.cc/sXP37g0T/IMG_20200531_203537385.jpg[/img]