For this purpose, the invention teaches that on the lower end of the outer part 4 there is a raised portion 6 which acts on the end of the first part 2 and thus effects a clamping or {HEAD ~ deformation} to achieve {TAIL ~ the clamping} 
to achieve
For this purpose , the invention teaches that on the lower end of the outer part 4 there is a raised portion 6 which acts on the end of the first part 2 and thus effects a clamping or { HEAD ~ deformation } to achieve { TAIL ~ the clamping }
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