a small ball called a fuse ball or simply a fuse preferably the bristles are heated by a non contact heater alternatively the fuses may also be formed by a contact heater or hot air cannon or chemically by softening a portion of the bristles with a solvent like the bristles the brush head 10 is also heated preferably by a non contact heater 30 as shown in fig4 a in fig4 b a magazine 32 is shown holding bristle bundles 34 just before fused ends 36 are inserted into holes 15 the diameter of the hole 15 is typically larger than that of the fuse 36 when the fuse 36 is inserted into the hole 15 the excess material in protrusion 21 flows around the fuse 36 to fix the bristles 34 in the hole 15 thus the fuse 36 is retained in the head 10 of the brush without expanding the walls 17 of the hole 15 as shown in fig4 c as the fuses 36 are inserted into the holes 15 the heated material in the head 10 may flow somewhat the face 35 of the magazine 32 from which the fused ends 36 of the bristles 34 project may be contoured or stepped to mold the flowing material and provide a shape to the face of the.