As I just posted to Yogthos, it's the downtime that will be costly here. The mirrors and prisms can be made cheaply enough when you take China's supply chain and large scale manufacturing into account, but the loss of production will have to be reduced somehow. Lasers require incredible precision; the difference between just barely touching the allen wrench and not can make the beam go from centered on target to completely off the detector. This translates to hours of tedious adjustments to get the beam back on target, even with alignment pins.