In the illustrated example the lower part 1 comprises a center plate 5 having a central bore 6 for the lock bolt 4 and two radially outwardly projecting {HEAD ~ arms} 7 extending at {TAIL ~ 90° angle} to each other and which can be welded to the bottom surface of the center plate 5 or can be secured thereto in any other way 
In the illustrated example the lower part 1 comprises a center plate 5 having a central bore 6 for the lock bolt 4 and two radially outwardly projecting { HEAD ~ arms } 7 extending at { TAIL ~ 90 ° angle } to each other and which can be welded to the bottom surface of the center plate 5 or can be secured thereto in any other way
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