Those holes you're referring to will weaken the posts, so I say it is not a good idea.
When using more than one coil, you'll typically end up using thinner gauge wire to make up the resistance needed anyways. Its not like anyone realistically wants a 4 coil wrapped with 28g wire!
When using more than one coil, you'll typically end up using thinner gauge wire to make up the resistance needed anyways. Its not like anyone realistically wants a 4 coil wrapped with 28g wire!