A tensioning frame for tensioning a printing screen, the tensioning frame being planar and comprising a plurality of elongate beams (41, 51, 61, 71, 81, 91, 101) which extend around the periphery of the tensioning frame to define the tensioning frame, each beam (41, 51, 61, 71, 81, 91, 101) comprising: an engagement side arranged such that the engagement side of each beam (41, 51, 61, 71, 81, 91, 101) is co-planar and orientated parallel to the plane of the tensioning frame, a beam body (47, 57, 69, 77, 86, 95, 107, 120, 130, 140), an elongate channel formed within the beam body (47, 57, 69, 77, 86, 95, 107, 120, 130, 140) which extends parallel to the length of the beam (41, 51, 61, 71, 81, 91, 101) and has an opening at the engagement side, an engagement body (7, 92, 121, 131, 141) located within the channel carrying an engagement surface (5, 99) for engaging with a printing screen in use, the engagement surface (5, 99) being movable with respect to the beam body (47, 57, 69, 77, 86, 95, 107, 120, 130, 140) along a range of travel in a plane normal to the length of the beam (41, 51, 61, 71, 81, 91, 101), and an actuator operatively connected to the engagement body (7, 92, 121, 131, 141) for moving the engagement body (7, 92, 121, 131, 141), and hence engagement surface (5, 99), relative to the beam body (47, 57, 69, 77, 86, 95, 107, 120, 130, 140), characterized in that at least one beam (41, 51, 61, 71, 81, 91, 101) comprises at least one strut (23, 124, 134, 144) which spans the elongate channel, so that the engagement surface (5, 99) projects outwardly of the beam (41, 51, 61, 71, 81, 91, 101) from the opening of the elongate channel and beyond the strut (23, 124, 134, 144), during at least part of the engagement surface's range of travel. an engagement side arranged such that the engagement side of each beam (41, 51, 61, 71, 81, 91, 101) is co-planar and orientated parallel to the plane of the tensioning frame, a beam body (47, 57, 69, 77, 86, 95, 107, 120, 130, 140), an elongate channel formed within the beam body (47, 57, 69, 77, 86, 95, 107, 120, 130, 140) which extends parallel to the length of the beam (41, 51, 61, 71, 81, 91, 101) and has an opening at the engagement side, an engagement body (7, 92, 121, 131, 141) located within the channel carrying an engagement surface (5, 99) for engaging with a printing screen in use, the engagement surface (5, 99) being movable with respect to the beam body (47, 57, 69, 77, 86, 95, 107, 120, 130, 140) along a range of travel in a plane normal to the length of the beam (41, 51, 61, 71, 81, 91, 101), and an actuator operatively connected to the engagement body (7, 92, 121, 131, 141) for moving the engagement body (7, 92, 121, 131, 141), and hence engagement surface (5, 99), relative to the beam body (47, 57, 69, 77, 86, 95, 107, 120, 130, 140), characterized in that at least one beam (41, 51, 61, 71, 81, 91, 101) comprises at least one strut (23, 124, 134, 144) which spans the elongate channel, so that the engagement surface (5, 99) projects outwardly of the beam (41, 51, 61, 71, 81, 91, 101) from the opening of the elongate channel and beyond the strut (23, 124, 134, 144), during at least part of the engagement surface's range of travel.