My favorite guitar, Hoboken, made magic. Yes, those are screws in the bridge, added by the previous owner; pickup installed under the bridge; refretted and nut changed to graphite; Schaller tuners replaced the originals that are in the case. It’s got bangs, bruises, and dents all over its body; it smells like a late-night bar-room before being cleaned. That said, I wouldn’t trade it for your best guitar. I picked it from the original owner in New Jersey.