2 ms·

You might have fitting issues with what I like to call "slide ruler error". How things came to be and are, are often at times not documented. Dimension and tol

• projektfu 6y ago
  Statistical quality control was not widespread at the time outside of a few enlightened industries. The Army was much more likely to buy a lot of parts where they could expect most of them would fit, rather than having all of the parts in statistical control within the tolerance limits.