We got a dynacraft kids bike for my daughter off facebook market, but need nuts to attach the training wheels. The ones we have don't seem to be threaded right or something (won't tighten all the way without becoming loose again, like the threads are slipping).
I've looked everywhere online but can't find anything saying what kind of nut it should be. How can I go about figuring it out? Dynacraft won't let me contact support without a serial # and I see no serial # on the bike anywhere.