I did a google search recently for "tenkara line spool" and found one pic of a guy that made his own "EZ Keepers" using two big buttons and some elastic cord. Gave it a try and in my mind it works great. The best part: I took/stole/borrowed/pillaged the materials from the wife's sewing room when she wasn't looking. So it was free. That and I ended up making a couple of wooden line spools like some of the other pics I saw. The work great for storing the line between fishing sessions.