Afaik those laser mirror assemblies are fine tuned to the nano meter range and still they need to finetune for a few months on site to account for the environme

Afaik those laser mirror assemblies are fine tuned to the nano meter range and still they need to finetune for a few months on site to account for the environment where the machine will be operating. All it takes is a bolt or some hardwired mechanism to render a 300 million dollar machine useless.