How do you set the units precision from 3 decimal places to 4 and it stays that way every time you open Inventor. I can change it in the document properties but it doesn't keep my setting.

Also is there any way to set the size of drill used when you creat a hole feature for a certian size tapped hole. When I creat a 1/2-13 UNC-2B tapped hole it creates a .417 dia hole. This causes a lot of problems when trying to use Feature based drilling in Mastercam as it wants to use a .4219 dia hole wich is the correct size. I can't find anything in help and I have not be able to find any tutorials

Thanks in advance