At one time our favorite vendor (NWOR) used to carry a rebuild kit.

You might first try tearing the ends apart and clean/grease everything well and see if they work any better. Often grease/dirt can fill up the adjuster threads and not let them tighten any farther. You can also try shimming the socket ends to tighten them up a bit.

r.c.brown@ieee.org
TruckEditor@tlca.org
Project: 4Crawler
4Crawler OffRoad - 4x4Wire discount code