Every few weeks again. The Koiguchi (opening) wear out. Constant Nukitsuke and Noto rasp always a little bit of wood away and eventually run the risk that a sword slams's feet. With a little wood glue and a toothpick Saya is back on its feet. Just a little glue to the toothpick evenly on one or two pages and almost ready to dry. Then let the sword in and out again, and dry completely. Finish is for Saya's training again fittest. 
