A method of manufacturing a brush or a paintbrush, in particular a varnish brush, by anchor-free fastening of at least one bristle bundle to a holding portion of the brush or paintbrush, wherein the at least one bristle bundle is fastened to the holding portion in an anchor-free manner, and the at least one bristle bundle to be fastened in the brush or paintbrush is manufactured by means of the following steps: (a) providing a bundle carrier which has a front side and an opposite rear side and at least one continuous opening connecting the front and rear sides, (b) uncoiling of bristle material from at least one bobbin (24 - 28) in the form of a strand (30 - 34) made up of a plurality of fibers arranged side by side, (c) inserting the bristle material that has not been cut to length into the bundle carrier , in particular from the rear side and in particular substantially perpendicular to the rear side, and (d) subsequently cutting off the bristle material projecting into the bundle carrier , so that a bristle bundle formed in the bundle carrier is formed, characterized in that the bundle carrier is the holding portion of the brush or paintbrush itself, wherein the holding portion is a portion that continues in one piece into the rest of the brush or paintbrush body or is a separate, previously manufactured component which is part of the later brush or paintbrush body. the at least one bristle bundle is fastened to the holding portion in an anchor-free manner, and the at least one bristle bundle to be fastened in the brush or paintbrush is manufactured by means of the following steps: (a) providing a bundle carrier which has a front side and an opposite rear side and at least one continuous opening connecting the front and rear sides, (b) uncoiling of bristle material from at least one bobbin (24 - 28) in the form of a strand (30 - 34) made up of a plurality of fibers arranged side by side, (c) inserting the bristle material that has not been cut to length into the bundle carrier , in particular from the rear side and in particular substantially perpendicular to the rear side, and (d) subsequently cutting off the bristle material projecting into the bundle carrier , so that a bristle bundle formed in the bundle carrier is formed, characterized in that (a) providing a bundle carrier which has a front side and an opposite rear side and at least one continuous opening connecting the front and rear sides, (b) uncoiling of bristle material from at least one bobbin (24 - 28) in the form of a strand (30 - 34) made up of a plurality of fibers arranged side by side, (c) inserting the bristle material that has not been cut to length into the bundle carrier , in particular from the rear side and in particular substantially perpendicular to the rear side, and (d) subsequently cutting off the bristle material projecting into the bundle carrier , so that a bristle bundle formed in the bundle carrier is formed, characterized in that the bundle carrier is the holding portion of the brush or paintbrush itself, wherein the holding portion is a portion that continues in one piece into the rest of the brush or paintbrush body or is a separate, previously manufactured component which is part of the later brush or paintbrush body. <EOS>