collar 58 fig1 is being shown to illustrate a surface modification tool other than an indexable cutting insert 64 however instead of being placed in the same location as the insert the surface modification tool is disposed in a surface 92 of the floating outer collar 58 in this figure at least one elongated ball 94 is disposed in the surface 92 the ball 94 may be held rigidly in the surface 92 or it may be free to rotate the ball 94 is provided for peening or burnishing of the work piece a plurality of balls 94 may also be disposed in the surface 92 the balls 94 may be elongated or round fig1 is a profile view of another hybrid friction stir welding tool 100 of the present invention in this simplified diagram an fsw tool 50 has an inner collar 70 and a floating outer collar 58 fig1 is being shown to illustrate a surface modification tool other than an indexable cutting insert 64 however instead of being placed in the same location as the insert the surface modification tool is disposed in the surface 92 of the floating outer collar 58 in this example at least one wheel 102 is shown disposed in the surface of the floating outer collar 58 the wheel 102 may be a grinding wheel the wheel 102 may be replaceable in order to use a wheel.