Preferably {HEAD ~ the bushing} has {TAIL ~ radial bushing projections} extending into the material and the frame has inner frame projections extending into the material 
has
Preferably { HEAD ~ the bushing } has { TAIL ~ radial bushing projections } extending into the material and the frame has inner frame projections extending into the material
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH