The fastener has a bell

The fastener has a bell (4) that rests on the mounting part (1) or the thickened part of the neck (1.1) of the mounting part. The lower sleeve (2.2) is stuck in the conical bell neck (4.1), so that the sleeve plate (2.2.1) forms a gap (S) at the upper edge of the coupling sleeve (5). The leaf spring (4.3) stands at a height on the outside. The spring is clamped down on the screw connection (4.2). 

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