new string broke after 3 months

[Richard Morgan]

In December I replaced a wound string on an execrable Yamaha electric piano (definitely a PS/POS).  That string broke on Sunday, and I've ordered a replacement.  Checking the underside of the v-bar that terminates the speaking length, where the string broke, I found a slight burr in the metal.  What can I do about that, in case that is what caused the string to break?

Thanks in advance,
Richard Morgan
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