Correcting a typo (g>0, not g>9.8). Sorry, Ludwik.
P.S.
It is interesting to speculate on the "like charges repel" versus
"like masses attract". Or on the "holes as free carriers" in some
electric materials. A hole is not an antiparticle (as a positron is)
but it is treated as a positive electric carrier. The absence of the
mass (in the punched region of the gravitational shell) acts as a
"small negative mass" inserted into the body of the shell; it can
be said to be responsible for g<9.8 above and g>0 below. Silly?