INCRA Mast-R-Lift-II Router Lift
This new model uses an exclusive system with a total of 5 sealed ball bearings on the lift screw and cam lock, making it the smoothest, lowest-friction router lift we've ever used - we've actually cranked up the heaviest routers with just one finger.  The quarter-turn cam lock is operated from the top using the lift crank to eliminate height drift.  The previous generation was effectively bomb-proof, and we expect the new model to continue that reliability.