It's a nyloc nut--you're just seeing the round end that holds the nylon gasket:
https://en.wikipedia.org/wiki/Nyloc_nut#/media/File:Nylon_Lock_Nut.png On Tuesday, October 9, 2018 at 8:24:02 AM UTC-7, Lum Gim Fong wrote: > > Looks like the nut is round, not six-sided like supposed to have in there. > It may be spinning as you tighten. Get six-sided nut then it wont slip as > you tighten. -- 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.
