Snap ring pliers or any pliers that open out are correct..
Can't do pics..
If I had to decribe em I would say when I am done grinding they look like a T on top of a triangle.I< kinda like that from the side..If u get the angle right it holds the grommet down as u apply pressure then when u squeeze the pliers they punch the inside wall of the grommet out an it makes 2 little holes. The metal that puhes out goes into the wood an holds the grommet..of course this in conjunction with a tight hole is a good thing..
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