An employee of mine worked at Magnaplanar. According to him, there is a burr in the arm tube where the wires have to make an angle to go through the bearing area. Sooner or later the burr damages the wire- in short (no pun intended) they all do something like this sooner or later.
IMO its a bit more work than just replacing the wire- the arm should be disassembled and the burr removed first.
IMO its a bit more work than just replacing the wire- the arm should be disassembled and the burr removed first.