A machine tool whose spindle has failed produces nothing. Restoring it is not a single act but a chain: the spindle has to be removed and shipped, diagnosed and quoted; the customer has to approve the work; the unit has to be repaired, tested, returned, reinstalled and recommissioned; and the machine has to be shown fit to make conforming parts again. Different parties control different links. The spindle maker or an independent repairer controls the workshop, the customer controls the approval and the reinstallation, the employer answers for the safety of the equipment once it is back in use, and a customer working to aerospace and defence quality rules decides whether production can resume without a new first article inspection. For most of European manufacturing this is a question of downtime and cost. It has become a question of defence policy because EU law now counts machine tools among the inputs to defence production capacity and has created instruments to prioritise products and services critical to defence production in a supply crisis. The question is what the public record shows, at the cut-off date, about the time and the conditions needed to restore machining capacity after a spindle failure, whether through repair, exchange or pooled spindles, and how far suppliers’ published terms, EU product and workplace law, customer quality rules, EU defence-industrial instruments and export controls determine that outcome.