I'm still a little bit confused. The traditional method of attaching this rack is with the threaded rod extending all of the way through the fork crown to be secured with a traditional nyloc nut on the back of the crown, as is visible here <https://process.filepicker.io/AevbsiaW2SbOjYpq8ea4Az/resize=width:1500/https://www.filepicker.io/api/file/dhbTJCahTnyjrKFQDinZ> on a picture of Mark's QB from the riv staff bike page.
Your description that "the nut fits perfectly inside the recessed part of the mount and lays flat against the crown," along with the fact that there is a spacer on the front of the crown make me think your rack was installed with a recessed caliper brake nut like these <http://wheelsmfg.com/brake-nut.html> (or perhaps shorter if came off a rear brake), with the threaded rod somehow trimmed or spaced out such that it terminates inside the fork crown. Is that the case? On Friday, April 14, 2017 at 9:26:54 AM UTC-7, Patch T wrote: > > Thanks you both. > > Jeremy, the bolt broke a half-inch beyond the bottom of the nut. There was > no washer or spacer installed between the nut and the fork crown; however > the nut fits perfectly inside the recessed part of the mount and lays flat > against the crown. There is a spacer on the front side of the crown. > > I ride a lot of unpaved roads and trails on this bike, and often with > things in the basket attached to this rack. Perhaps it had been loose for a > while and became stressed over time and under weight? > > > Patch > > > > > > > -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at https://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
