mounting assembly the blades 46 and the bushings 68 u2032 70 u2032 72 u2032 and 74 u2032 are aligned with the hole 62 in the mount 60 after the insertion of the pin 64 u2032 where the locking pin 76 u2032 is conducted through the grooves in the bushings 68 u2032 70 u2032 72 u2032 and 74 u2032 the head 80 u2032 of the pin 64 u2032 and the fourth bushing 74 u2032 the belleville spring 66 is compressed with an appropriate tool the pin 64 u2032 and or the fourth bushing 74 u2032 is rotated through 90 u00b0 with a corresponding tool and the tensioning tool is released thereby the locking pin 76 u2032 comes into contact in the second groove that is a blind groove of the recess 84 u2032 of the fourth bushing 74 u2032 and thereby arrests the mounting assembly here the locking element is the locking pin 76 u2032 interacting with the fourth bushing 74 u2032 here too the disassembly is performed in the reverse sequence it should be noted that in both embodiments it would be conceivable that the belleville spring 66 be attached at any desirable other location in which it forces the locking pin 76 or 76 u2032 into the recess 84 or 84 u2032 it could be arranged between the second bushing 70 or 70 u2032 and the mount 60 then it is indirectly attached to the pin 64 64 u2032 or between the mount 60 and the third bushing 72 or 72 u2032 then it acts upon the fourth bushing 74 74 u2032 it could also if necessary with the use of appropriate washers be positioned between the fourth bushing 74 74.