There's a thread with illustrations on how to bend the grommet from last month. I believe the author advocates using a similar sized piece of dowel to hold the grommet and not the actual plug. This way you can whack away and not injure the plug body.
Also, I've noticed the plugs I have that do have bent belly grommets are not nickle plated. Perhaps the plating will crack under the stress and they are better counter sunk.
-spence
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