My first attempt at a fidget slider (and my first ever model upload :-) ), the magnets(12 6x3 round neodium) can be put in with or without glue.  The top part locks them in place with just press fit.  Glue can be used, then the clicky sound wil be less.  The middle part can be pauzed to put the magnets in, the slider can be used without the middle part also.  A little bit of silicone lubricant helps it slide easier but is absolutely not neccesary as seen in the video.  Enjoy!