Device for fastening a first part such as an accessory to a second part such as a support with a bush for eliminating the assembling backlash between the two parts and bush used for the fastening of these parts

A device for fastening a first part comprising at least two substantially parallel fastening lugs, respectively with two inner bearing faces opposite to each other, to a second part with two opposite parallel outer faces disposed between the two bearing faces of the fastening lugs with an assembling backlash, and comprising at least two screws for the fastening respectively of the two fastening lugs to the second part, this device comprising a bush with inner and outer threads with opposite pitches, interposed between the threads of one of the fastening screws and an inside thread of the second part matching with the outer thread of the bush, the inner thread of the bush matching with the thread of the screw with a reduced backlash in order that the bush can move axially in the inside thread during the operation of tightening of the fastening screw so as to abut at one of its two free ends against the inner bearing face of the fastening lug through which the said fastening screw passes.