Guitar repair shops?

Hey Chicago!

A couple of my guitars need some minor repairs and I was wondering if anyone knew of a solid place to go to? I think Guitar Centers will perform repairs but let me know of any hole-in-the-wall places that have a good reputation for this sort of thing.

Issue #1: Martin electric acoustic; the jack on the underside is completely loose to the point where it's sliding out of the body

Issue #2: Ibanez electric; a screw fell out of the back of the neck near the headstock and I'm not sure what it's for ಠ_ಠ

I live up north in the Edgewater neighborhood but I'll travel within the city for quality service and a good deal.