You don't need a grinder ... a decent dremel with cutting disc should do.
As per @Dogtemple above; cut a slot in the top of the cone and then either use a flat head scredriver. To be honest, you might even be able to do it with a junior hacksaw.
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You don't need a grinder ... a decent dremel with cutting disc should do.
As per @Dogtemple above; cut a slot in the top of the cone and then either use a flat head scredriver. To be honest, you might even be able to do it with a junior hacksaw.