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Heddon used grommets, or cups originaly to help protect the plugs from hook damage, the grommet protects the area around the swivel from being damaged and thus allowing water to enter through the damaged area, thus splitting the plug..weather this actualy works or not, who knows.. I use them and have a step drill that does the drilling and spot facing in one shot...., IMHO, a plug without grommets in the belly holes looks un finished...
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