'FredC' - If it is OK with 'Whig', I will photograph his data and forward it to you.

FWIW - The difference between the largest (.4791") and smallest (.4600") Bolt measurement was .019", or about the thickness of 4 sheets of typing paper.

If you throw out the extremes, (4 low and 3 high measurements), the measurements all fall between .4694" and .4780" or .0086", less than 9 thousandths of an inch variation, about the thickness of two sheets of typing paper.

The 45 bolts in the middle of the pack vary less than .005", (between the shortest and longest), the thickness of one sheet of typing paper!