[numbskull]

I suspect something like this has been posted before, and I know that "eastendlu" from the SOL board has made a bunch of metal ones for people, but since from time to time the wheel needs reinventing, here's what I made to curve grommets so they conform to the bottom of the plug. I just turned hard maple to a hair under 1.25, 1.0, 0.75 inches, then drilled similarly sized holes in hard maple with Fostner bits and cut the board down the middle. Drill holes for each size grommet you use (they need to be a tight fit) parallel to the grain lines, load it, and whack it with a hammer. Works pretty well.