Phisherman wrote:

I'm installing a new toilet on a basement floor. I lined up the
flange slots with the bowl holes and traced around the perimeter of
the toilet. When dry-fitted It slightly rocks on the concrete floor.
I can remove small amounts of the concrete with a Dremmel tool. Is
there an easier way than trial-and-error to determine the high points?
How is this usually done? I'm guessing that this rocking has to be
eliminated before I can proceed with the install? TIA

I'm sure there are a lot of ways to level it, but personally I'd cut a
gasket for it from a roll of sheet gasket material you can get at an
auto parts store. If the out of level is slight as you indicate it
should accommodate it. If there is really a high spot you will need to
knock it down and an angle grinder with a masonry wheel will be 10,000X
faster than a dremel.