A method 1, and wherein the fixing member comprises at least two round disks whose axial lengths are considerably less than their diameter, and positioning said disks a distance apart from each other, between the plates, and separately welding {HEAD ~ each} of {TAIL ~ the disks}, at their lines of contact, to each of the plates 
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A method 1 , and wherein the fixing member comprises at least two round disks whose axial lengths are considerably less than their diameter , and positioning said disks a distance apart from each other , between the plates , and separately welding { HEAD ~ each } of { TAIL ~ the disks } , at their lines of contact , to each of the plates
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