Another point to consider is that one person can do all of the jobs required to get the parts made.
Not all people, when a person is made to wear many hats, (take on many different responsibility's) things suffer usually quality and efficiency.
Some people can over come this, more people can't or are not willing.
"Determine that the thing can and shall be done, and then we shall find the way." -- Abraham Lincoln
We have adopted new policies. Please read each one carefully.