I understand that the thread used for Watling carriage bolts and other slot machine manufacturers bolts is 10-24. 24 being the number of threads per inch. I purchased a quantity of 10-24 square nuts on ebay to fit the original Watling carriage bolts. They arrived and they don't fit. They do fit new 10-24 carriage bolts but not the old original Watling bolts. Has anyone else had this problem. The nut is 10-24 NC so it should fit. I am completely at a loss as to why it does not fit. Any help greatly appreciated.
Lol (Laurence)