It doesn't turn freely; I can wedge a screwdriver tip under an edge, but my
guess is that it is more the soft floor pushing down under the screwdriver
tip, rather than the plate coming up.

I guess if the floor is that soft anyway, it doesn't matter? If it were
under pressure I'd think the floor wouldn't be soft (it would be under
pressure, or bust through).

Still kinda anxious about actually starting demolition, without knowing why
that thing is there...

Thanks,
Keith


"Matt" wrote in message
oups.com...
Have you tried turning it? Is there any tension on it?