So, my B string has broken every week for the past three weeks. I have a show coming up, and I need this to be fixed. The string breaks at the bridge, which I understand means it's a problem with the bridge. How do I fix this?
Check for excessive string tension and any sharp spots on the saddles.Those are usually the leading causes of string breaks at the bridge.
This the second 513 I've heard this happening to in the last while! Check where the string falls as it exits the trem block hole before it crosses over the saddle. Does it rub against the side of the hole?
Aside from checking the Saddles check the bridge and tuners for a sharp edges. Does the 513 only come with a Trem? I forget, sorry. Then Check all the spots where the string comes in contact with any metal. Maybe try a different brand of strings if you can't find any problems with the guitar.
It does seem to rub against the side of the hole. If I intonate it, should that fix the problem?
Possibly but not guaranteed! Only if the adjustment moves the saddle back far enough to lift the string off the edge of the hole. If it doesn't you may want to consider sanding the perimeter of the hole to ease the edge.