This model provides a way to add bead chain retension to a screw cap or dust cover.  It is sized for a 3.2mm bead chain. 

Use this with your preferred glue.  I used Bob Smith thick CA glue and activator.  Add glue to the recess then insert the chain end.  Use of activator will speed up curing & help avoid pulling out the chain before curing finishes.  

Print two copies of the mode for use with a flat top cap,  one for the cap and one for the case or panel body.  Glue to the surface.

Fusion 360 source and .STEP files are provided.