According to the invention, each screw (31) for the assembly members (29) fixing the guiding and driving bearings (30) to the upper part (11) of the housing (9) is fastened to a retaining member (36) which retains the screw (31) substantially in its appropriate position and which prevents the screw (31) from rotating during the tightening or slackening of the nut (32). The screw (31) and its retaining member (36) form a removable assembly. …IMAGE…
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