  Applying Dirac's procedure to $r$-dependent constrained systems, we derive a
reduced total Hamiltonian, resembling an upside down harmonic oscillator, which
generates the Schwarzschild solution in the mini super-spacetime. Associated
with the now $r$-dependent Schrodinger equation is a tower of localized
Guth-Pi-Barton wave packets, orthonormal and non-singular, admitting equally
spaced average-'energy' levels. Our approach is characterized by a universal
quantum mechanical uncertainty structure which enters the game already at the
flat spacetime level, and accompanies the massive Schwarzschild sector for any
arbitrary mean mass. The average black hole horizon surface area is linearly
quantized.
