Replacing Epiphone Nut

Guitar nuts are replaceable?
I have a guitar, epiphone g-400 custom. I recently bought a little heavier than the average chains (I think they are size 10 to 52) and chain mail under broke a small piece of the nut (which holds the strings in place, between the head and neck.) I can replace this part, and if so, how?
http://www.allparts.com/ << 1980 Fender Lead II Demo (Baz Studios)

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? For Removing or Replacing Antennas Four double-ended sockets fit eight common domestic and import antenna nuts. The smaller three sockets are 7/8'' hex and the larger socket is 1 1/4'' hex. Sockets are made of heat-treated alloy steel for strength. Complete applications are listed on the card. Includes: Antenna Nut Socket #1, Antenna Nut Socket #2, Antenna Nut Socket #3 and Antenna Nut Socket #4.By Lisle.
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For Removing or Replacing AntennasFour doubleended sockets fit eight common domestic and import antenna nuts. The smaller three sockets are 7/8 hex and the larger socket is 1 1/4 hex. Sockets are made of heattreated alloy steel for strength. Complete applications are listed on the card.Includes: Antenna Nut Socket #1 Antenna Nut Socket #2 Antenna Nut Socket #3 and Antenna Nut Socket #4.
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