Jason Owen

Greetings everyone, I have a Garrison G50-CE which I've been told may soon need a neck reset to the tune of about $1200. Since I paid only about half that for this guitar, it's not an investment I'm inclined to make. I noticed on the inside of the body where the neck-heel meets there is a large (3/16") hex bolt which appears like it might be some type of adjustment. I've never seen this on any other acoustic. Does anyone know what that's for? I can find no info on this anywhere online.