A holding element (60) for a device for supporting and/or guiding a machine tool (20) or a workpiece (W), wherein the device includes a contact body (40) having a contact surface (42) for contact on a work surface (H) of a workpiece (W) or a wall. It is provided that the holding element (60) includes an adhesive means (70) for adhesion to the work surface (H) and a fastening means for a releasable hold on the contact body (40), wherein the fastening means includes at least one formfitting contour (90) for formfitting hold on a holding element receptacle (55) of the contact body (40).

A mortise and tenon alignment jig includes a generally oblong body having a first straight longitudinal side, an opposing, second straight longitudinal side, a first semi-circular end portion connecting first ends of each of the first and second sides, and a second semi-circular end portion connecting second ends of each of the first and second sides. A top face has a lip extending outwardly of the body. A raised imprint surface is formed on a top of the top face. The imprint surface has a central gap and four orthogonally spaced arms extending outwardly from the central gap.

A support assembly for a guide rail for a cutting tool is described. The support assembly includes a base element with a mechanical interface which is configured for a detachable connection with the guide rail. Further, a support arm having a first end pivotably supported on the base element and a second end configured to support the support assembly on a support surface is provided. The support assembly additionally includes a locking mechanism configured to selectively lock the support arm with respect to the base element in at least two different relative pivotal positions. Furthermore, a guiding assembly for a cutting tool as well as a use of a guiding assembly is presented. Also, a use of a support assembly is described. Moreover, a method for operating a guiding assembly is explained.