Few Minnesota companies have navigated monumental disruptions to its business model as well as Northern Tool + Equipment, the 45-year-old maker and retailer of hydraulic tools based in Burnsville. "It's a high-end consumer group, people who do things with a lot of pride and passion," said John Bakke, Northern Tool's chief operating officer. But it is in manufacturing where Northern Tool has experienced the most recent — and biggest — change. The 260,000-square-foot building was about evenly split between production space and warehouse space. To find room in the factory, Northern Tool carved into space that had been used for parts inventory.