I split balsa baits with a razor blade, using a scribed line around the bait as a guide. Can't drill a straight hole to save my life! It's also nice to have access to the whole interior of the bait for routing wire, installing weight, rattles, etc. Having a solid epoxy "backbone" throughout the bait when you join the halves provides a lot of reinforcement too. I use smaller wire than Yake since there aren't many big toothy critters swimming down here in the S.E.