This can go back to Obama shutting down domestic lead protection.
It’s not only a lack of tools. It’s also a lack of experienced and knowledgeable machine operators. People do not realize the expertise it takes to be constantly maintaining and adjusting the machines to make sure products are up to standard.
A slightest mis-adjustment to a machine screw can cause a part to be produced which is off by the slightest bit and thus will not fit with the other parts manufactured. You see this in cheap products you order which have to be assembled at home. The screw holes are misaligned, the screws are too short or mis-threaded, etc, etc. Most machinists carry a micrometer in their tool belt to take measurements of items coming off the line to make sure those products are according to specifications.
The experienced machinists have all retired or passed away and there is no one to teach the skill to younger workers (if you could find any that wanted the job or were skilled enough in math to be hired). Several decades ago, plenty of young men and women who had no desire to go to college, found a job at such a factory. They made good money and found a career. The globalists shipped all those jobs overseas and took away those career opportunities.