Acoustic guitar drilling

[Jeff Scott]

Use an endpin jack, they were designed to be used there for a reason.

[pinkheadedbug]

What you are proposing will destroy the sound of your guitar and the first time you have a yank on the cord it will destroy the guitar as well. Use an endpin.

[mcgruff]

A guitar is a kind of bellows driven by vibrations in the top. It's the most important part of the instrument.

In a good guitar, the top wood is carefully selected from (usually) the stiffest and lightest spruce a luthier can beg steal or borrow. It's thicknessed very precisely and then braced to a very specific pattern with hand-carved braces. Throughout the process the luthier will be tapping away and listening to how the wood rings out, shaving and sanding at each step to tune in the desired sonic qualities. The weight of the top is crucial: it has to be as light as possible without actually falling apart (hence the need for stiff types of wood). Bridge pieces are weighed out to the gram. Even the weight of the finish is taken into consideration.

So no: you don't want to bolt a jack socket on to the top. It'll affect the structural integrity and the mass will stop the top vibrating in the way it was designed to.

If you ever plan to work on any kind of wood acoustic instrument, you must ask a luthier for advice. They're not just shipping crates with strings.