Since I don't want to blow the bucks for a router lifter or a router with a micro adjustment feature to slap into my cheapo bench router table, I am trying something else. I've purchased a small scissors jack with a low top clearance (3 1/2"). I fastened the router table legs on top of some 4" blocks and screwed the blocks into the work bench top. Now when I want height adjustment I just slide the jack under the upside-down router, hike it up, fiddle up and down as required, then lock the router slide into place, remove the jack - and rout. Works fine so far.
FoggyTown