My friend let me borrow his (costly) custom Carvin String-through bass while he's on vacation and I can't get the E and A strings out through the back! The D/G strings came out very easily but these other 2 seem stuck. when my hands started to hurt trying ot pull em out, I got a pair of pliers and tried yankin them around, but to no avail. What should i do? Disassemble the bridge?