Abstract: A hydraulic damper has a dashpot piston reciprocating in a cylinder bore. Piston rods extend axially from both sides of the piston. Sealing structures at both ends of the cylinder connect to the cylinder and sealingly engage the piston rods to form two symmetrical hydraulic working chambers divided by the dashpot piston. A narrow passage through the piston provides a restricted fluid flow path between the two working chambers for hydraulic damping of piston motion. A cavity in the first piston rod is provided with a spring-biased, sliding reservoir piston forming a pressurized hydraulic fluid reservoir connected to the midpoint of the narrow passage between working chambers by a narrow conduit. Both narrow passage and conduit have fixed dimensions and no valves. A cavity in the second piston rod contains a spring centering mechanism.

Abstract: A device for full depth hand routing characterized by a two piece base including a foot block and an attachment block, the attachment block being held to the foot block by a connector bolt and two adjusting screws to enable attaining parallel planes for a tool in the base of the block; a cantilevered holder extending from the attachment block; a tool on a shaft that is powered by a motor within a housing that has a substantially cylindrical barrel and a protruding threaded male part threaded engaging a threaded aperture on the cantilevered holder; an indicator scale around the base of the barrel and above the threads; and indicator carried by the attachment block and extending upwardly adjacent the depth scale such that accurate depth positions can be attained for routing to a desired depth. In a preferred embodiment, the cantilevered holder comprises a ring that allows 270.degree. visibility about the routing tool. Also in the preferred embodiment, the foot block has an upstanding flange at 90.degree.