My home built drill press (not built by me) sits on a metal bench. The way I raise or lower the heavy table is by a dedicated hydraulic jack between the bench and the collar structure. A modified screwdriver is permanently attached to the jack's valve, and the pump handle never leaves the jack. Collar is loosened/tightened by two clamping bolts. Their wrench lives a couple of cm away and is held by a microwave magnetron's magnet sticking to the collar. This many-featured drill press has served me well for 29 years. I'd post pictures, but the immediate surroundings are a mess.