then you might want to gently pull on the 'discs' to see if they come off, and if they do then you might want to glue them in place.
If you don't do this then you might find that one of the discs comes off and a whole load of cord spools off the reel and gets very tangled up. And then you might find yourself having to spend a load of time untangling it and winding the cord back on the (glued) spool.
Don't ask me how I know this ............