thru wire is a pain in the butt and the strongest way to build a crankbait.
Take you blank and cut in half, now bend your wire to fourm the tail hanger, belly hanger and line tie.
place inside of bait halfs and glue back together. That's it in a nutt shell, but there are more steps than that. You have to accout for your balast weight and lip.
I don't use this method, it adds a load of time to the build. I've never had a hanger or line tie pull out of any baits that I've made (so far).
Here is an example