You don't want to use a Crescent wrench or any other one armed wrench on a
reamer of any kind. This is the best way to make a bad hole with the reamer
as the forces on the reamer will force it sideways in the hole.
The best way to drive a reamer is in a drill press or mill with the hole
right under the spindle so that there are no sideforces on the reamer. If
you have to ream something by hand, you hvet to use a two handled driver of
some design so that the forces on the reamer are all down and around and not
to the side. The two bar holder as described in another post in this thread
is a nice quick and dirty design that works well, a bar with the appropiate
sized hole in the middle of is another choice and there are ones available
at the better tool stores.

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Why do penguins walk so far to get to their nesting grounds?