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I have changed MANY GP's and never owned a reamer until a few months ago (one was given to me). I actually pulled the four GP's from my 240 yesterday to test them (wanted to put power to them to see how long each one took to glow), and they all tested perfect. Forgetting that I had a reamer (until just now when I say your poll), I put them back in. I don't remember ever having had a problem getting a plug out or in. My vote would be no, but I am not saying it is not a good idea to use one if you have one on hand. If I would have remembered that I had one, I probably would have used it.....Rich
EDIT: I have heard of folks using a drill bit. I imagine one would work if only twisted with your fingers, and gradually increasing in size until you can't turn the bit with your fingers. Realistically the size should be a few thousandths larger than the part of the GP that extends into the prechamber.
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