Re: Neck Bowing at Joint?
I guarantee that I could fix ANY screw hole, ANY size, in any guitar using toothpicks and wood glue (Titebond, Elmers, etc) and it would be as strong or stronger than any hole you could fix using any method you choose, dowels included.
So this is NOT a strength issue, but a convenience and/or aesthetic issue...dowels being the most aesthetic (when done correctly) and toothpicks being the most convenient (BY FAR!!!). But, since the repair is not visible with either technique, then aesthetics really doesn't play a part.
If you've got a few bucks and couple hours to spare that you have no clue how you are going to spend and nothing better to do, and you don't mind the risk of causing minor or even major damage to your guitar, then by all means go ahead and try the "drill and dowel" technique (I agree that this is the most elegant technique). But if you want to fix the problem right now (well, 1-5 minutes at most) for essentially NO cost and NO risk of damage to your guitar, and end up with the same strength and function, then try toothpicks and glue.
I have been using the toothpick method in home construction, fine furniture building, and guitar repair for 60 years with no problems or failures...no, NOT ONE! That's a pretty good "reliable" reputation in a lot of different applications.