You disassemble it, press out the old bushing, press in the new bushing, hone to size.
Clean and grease all parts and reassemble.
If you do not have a hone to size the new bushing then you cannot rebuild it.
If you need someone to rebuild it, let me know I do them all the time.
I also have the old & new style bushings listed on my website,
www.RPMracingCa.comRandy - RPM