Linn's founder, Ivor Tiefenbrun, is above all an engineer who believes in measuring what caused changes. He figured that if a turntable could be assembled with a screwdriver, it could be repaired with one. It could also be upgraded. By having each unit assembled and signed by an individual, it could be returned to that individual for repairs. This became a learning process feeding into engineered improvements.
There's a fascinating read here A Wee Dram of Scotch: Linn Products' Ivor Tiefenbrun | Stereophile.com