Originally Posted by mbshop
all metal lock nuts seem to have disappeared from the stores. i had to order mine from ebay. but there is a trick with regular nuts. use two and jam them together. also you can make a more permanent "lock" by damaging the bolt threads and then jamming the nut on. more damage=more tightness.
You should be able to find all metal lock nuts(aka stover nuts or grade C nuts) at any fastener supplier such as Fastenall or Graingers