In {HEAD ~ one aspect} of {TAIL ~ the invention}, the elastomeric insert is bonded, either adhesively or chemically, to the frame, and in another aspect of the invention, the elastomeric insert is mechanically secured to the frame 
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In { HEAD ~ one aspect } of { TAIL ~ the invention } , the elastomeric insert is bonded , either adhesively or chemically , to the frame , and in another aspect of the invention , the elastomeric insert is mechanically secured to the frame
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