The author remixed this model.
Modified to use jewelry eyelet pins. The idea was to have a hole that the eyelet pins could easily slide in. Please be warned that you will need to drill a hole after printing. For whatever reason even though the model shows a hole. Many printers it is solid in the middle. My attempts to increase the hole size causes unwanted artifacts on the exterior. If I figure it out I will update the model at some point. Cheers!