Abstract: A method and tool for sealingly inserting an elastic body in a cavity in a wall in which the cavity has a smaller size than the initial size of the body. A first tubular end portion of the tool is inserted into the cavity and an elastic body is accommodated in a second larger tubular end portion of the tool such that the elastic body rests on a tapered portion which joins the tubular end portions. The second tubular end portion is then closed and pressure fluid is supplied into the second tubular end portion to compress the elastic body and cause it to pass from the second tubular portion into the first tubular portion and then to exit from the first tubular portion into the cavity. The elastic body expands as it exits from the first tubular portion to tightly engage the wall around the cavity and to expel the first tubular end portion from the cavity.

Abstract: A lubricant unit intended for application between the contact surfaces of two bodies for reducing friction between the bodies during displacement of the bodies relative each other especially in the case where one or both of the bodies comprises a porous material. The lubricant unit in its unapplied condition comprises at least one film with mutually opposed film surfaces and a lubricant deposited between these surfaces. After placing the unit between the bodies whose friction is to be reduced, the contact surface of at least one body is covered by film, whereby the necessary force for overcoming friction between the bodies will depend solely on the friction between a film surface coated with lubricant and a contact surface, or on the friction between two lubricant-coated film surfaces.