Well, my first thought was put down a piece of tape, drill through the tape
(and floor) with a small drill bit, and inject some epoxy into the cavity.
I have NO idea if this is a good idea or not, but it's my inclination.

--
Clint
wrote in message
ups.com...
I had br111 brazilian cherry installed last week but have some
questions. It was glued down to a concrete floor. However, there are
a few hollow sounding spots and a few spots where the floor actually
"gives" a bit when you walk over it. What can I do and how can I hold
the installer responsible. Is this to be expected with this type of
installation? How can this be fixed?