Device for attaching an insertion part to a base surface

An attachment device for attaching an object to a base surface, comprising:

• the object having an insert that is to be secured to the base surface;
• said insert having a longitudinal axis and a cross-section comprising a circular arc;
• an attachment clip for being secured to the base surface;
• said attachment clip having an aperture formed therein and shaped for receiving said insert;
• said insert being rotatable in said aperture between a first and a second rotational position;
• and
• means for detachably securing said insert in said aperture, said securing means comprising a dentate structure on one of said insert and said attachment clip and locking means disposed on the other of said insert and said attachment clip for engaging said dentate structure;
• said dentate structure comprising a plurality of serrations arranged one behind the other in the direction of said longitudinal axis;
• said dentate structure and said locking means being so disposed as to engage each other to lock said insert in said aperture at any one of a plurality of insertion depths, each said depth corresponding to an engagement of said locking means and one of said plurality of serrations;
• at any insertion depth, said engagement occurring when said insert is in said first rotational position, and said dentate structure and said locking means being further disposed as not to engage each other when said insert is in said second rotational position, whereby said insert can be inserted into or drawn from said aperture when said insert is in said second rotational position.