Many fixed base routers have an adjustment mechanism built in that you can access if it is mounted in a table.
For example, my Ryobi router (the least expensive one at Home Depot) has a fairly easy way to adjust it while mounted in a table.
To adjust it, you reach under the table and loosen the clamp. then you crank the knob with a long handled t-wrench to set the height. then you reach under again and close the clamp again. You can see the adjustment mechanism on the left below. There is a hole in the plate that lets you reach the adjuster with a wrench.
I would be surprised if the Craftsman didn't have something similar. This Ryobi one was only $59.
Even so, I didn't want to deal with reaching under the table all the time, and I didn't want to spend the money for a commercially available lift, so I made my own lift. It was not very hard to do, and I am a novice. Now I don't need to reach under the table at all.
Last edited by Chris Curl; 03-26-2012 at 11:49 PM.