How to fix loose end pin jack in a Martin acoustic guitar.?
How can I tighten the loose nut inside that holds the jack tight. I can’t get my hand all the way in through the hole. Is there a special wrench? How much would it cost to have someone else do it?
Acoustic Guitar senior editor Teja Gerken demonstrates the Martin GPCPA1. For the full review, please visit www.acousticguitar.com