Struggle to keep tools standstill?
It may not be correct to say this hack would be helpful with this particular flashlight because it is not precisely cylindrical: there is a slight change in the shape, which would prevent it from rolling. Nevertheless, a piece of foam would stop other flashlights from moving around.
If you have a cylindrical flashlight (or any tool shaped that way), you probably have struggled to keep it still more than once. A piece of carved water woggle can hold the lantern, and the inclination will stop it from rolling.