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About a year ago I faced the same problem. I already had a router table and a bench to mount it on, but still had the problem of manually lifting/lowering the router and locking it to height each time, a slow and labourious task. To resolve this I made a cradle for the router with the supports under the two handles. On the bottom shelf I mounted a car scissor jack, and fixed a support pole between the jack and the base of the cradle. Now I can adjust the router as fine as I want. I wish I had seen yours earlier though.