Such centralising elements are also provided in {HEAD ~ the shoe support} of {TAIL ~ the present invention} in this case, moreover, convenienctly each such element supports one of said two shoe engaging members 
of
Such centralising elements are also provided in { HEAD ~ the shoe support } of { TAIL ~ the present invention } in this case , moreover , convenienctly each such element supports one of said two shoe engaging members
OTH OTH OTH OTH OTH OTH OTH HEAD 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 OTH OTH OTH