I bet I messed up not Chris, If the rotary table is off .005" that will make the bolt circle off by .010" so it is easy to mess up. I try to make all the parts that fit together with out removing and replacing the table but sometimes I can not. I picked .300 because that is 4.80" 1:1 in 1:16 scale witch is kinda in the mid of what is used on race cars so should look right. On the plus side Chris will have some extra parts for his next drag race project.