Additionally, a plunge router cannot easily be removed from its base, which means you have to change bits with the tool attached to the table. A fixed-base router is easily removed from its base, unlike a plunge router. That feature makes it a snap to gain full access to the collet and locknut when changing bits. The Bosch, DeWalt and Milwaukee routers have the greatest amount of travel. Depth changes made easy.
Most routers employ a thumbscrew to lock the base to the motor.
The Bosch 1617 is designed differently. It has a two-stage system, consisting of a pair of locking levers. A pull of the main lever loosens the motor. The spring-loaded second lever provides a coarse adjustment and also prevents the motor from coming loose from the housing unless pressure is maintained while the motor is twisted. A screw dial allows for fine adjustment.