Finally; someone (Saltyshop) agrees with me that the drill press is the easiest way to drill the through wire.
richiep,
Before the drill press I would through drill first, then turn. That works pretty well, but the wire will always be center. Sometimes you may want the line tie higher or lower.
Another way is to turn the plug and drill the hole for the gromet/swivel. Then carefully drill starting with a shorter bit to the gromet/swivel hole from each end. With this method there will be misses, but that is the challenge of plugbuilding. Enjoy the hobby